Metaphysics Is Shit
Philosophers love to tell scientists that they are "doing metaphysics whether they admit it or not." I spent an evening trying to get a straight answer to one simple question: name a single metaphysical claim that actually did something. Not a vibe, not a framing, but a result. I never got one.
The challenge
For physics, the answer is easy. Newton. Maxwell. Einstein. Each made claims, the claims were tested, and the world changed: bridges, radios, GPS.
So what is the equivalent for metaphysics? What is its Newton?
Attempt one: the Ship of Theseus
The classic example of a "metaphysical question" is whether a ship that has had every plank replaced is still the same ship. This is not a deep question about reality. It is a question about how we choose to use the word "same." Decide on a definition and the puzzle disappears. That is a dictionary problem, not a discovery.
Attempt two: atomism
The usual trump card is Democritus, who supposedly "predicted" atoms 2,400 years ago through pure reason. Two problems.
First, his actual claim was disproved. "Atom" literally means "uncuttable," and the defining thesis was that atoms are indivisible. Physics split them: electrons, nuclei, protons, neutrons, quarks. The one part of atomism that was pure reasoning turned out to be false.
Second, and more importantly, atomism was never metaphysics in the first place. It was a claim about the physical world: matter is made of tiny discrete particles. That is a physics hypothesis. Democritus simply had no way to test it yet. A hypothesis does not change its nature when the experiment finally arrives; Dalton, Brownian motion, Einstein and Perrin did not turn metaphysics into physics. They confirmed a physical claim that had been physics from the get-go. If a claim can eventually be settled by observation, it was always physics, just untested physics. Metaphysics only gets credit by claiming physical hypotheses before physicists get around to testing them.
"But physics makes untestable assumptions too"
Yes. Einstein imagined time dilation long before anyone could measure it. Physicists today speculate about things nobody can test yet. That is still physics. A hypothesis waiting for an experiment is not metaphysics; it is physics with a to-do list.
"But science rests on assumptions it cannot prove"
The last line of defense is that science assumes the uniformity of nature, that the laws work the same everywhere and always, and that this can never be proven, since every test already relies on it.
Fine. But those are basic working assumptions of physics, made by physicists, refined by physicists, and abandoned by physicists when they stop working. Physicists dropped absolute time. Physicists accepted fundamental randomness at the quantum level. No metaphysician handed those down. Calling the foundations of physics "metaphysics" is just relabeling physics and then taking credit for it.
Metaphysics is a bunch of guesses
Strip the vocabulary away and most of what gets called metaphysics is guessing. Many of the big questions are binary: matter is either infinitely divisible or it isn't; the universe either had a beginning or it didn't. Guess blindly and you have a 50% chance of being right. Being right by chance proves nothing.
Take the beginning of the universe. Christians point out that the Bible says the universe had a beginning and treat the Big Bang as vindication. But the authors of Genesis guessed, and the guess is easy to explain: people are uncomfortable with an infinite past. Aristotle guessed the opposite, that the universe is eternal, and for roughly 2,000 years that was the consensus among scientists.
Note the wording: the consensus among scientists, not a scientific view. A view held by scientists is not a scientific view. A scientific view is one with evidence behind it, and for 2,000 years there was none either way. The question only became science in the 20th century, when expansion and the cosmic background radiation gave us something to test. Before that it was a coin flip, whether the one flipping it was a prophet, a philosopher or a scientist.
Democritus is the same story, except he lost the coin flip. He guessed that atoms are indivisible, and physics split them. The supposed crowning achievement of metaphysics is a 50/50 guess that came up wrong.
2,500 years without convergence
After 2,500 years, philosophers still disagree about free will, causation and what exists. Surveys of professional philosophers show the same old splits, decade after decade. A field that makes progress converges. Physics converges. Metaphysics doesn't.
The untestable part can't lose
Some metaphysical claims can be proven wrong. Atomism was. But those were physics all along, just physics that hadn't been tested yet. Take them away and what remains is the claims no observation could ever refute. That's why bad ideas in metaphysics never die: Aristotle is still taught right next to his opposites, and nobody can say who won. A game you can't lose isn't a game, and a theory that can't be wrong isn't saying anything.
The intuitions have a source
Cognitive science now explains why we feel there must be souls, essences, or a beginning to time: that's how evolved brains model the world. Those feelings are facts about us, not about reality. Metaphysics takes the quirks of human psychology and mistakes them for the structure of the universe.
"But you're making a metaphysical claim yourself"
The favorite trick: "saying metaphysics is nothing is itself a metaphysical claim." This is a word game. If every statement about what is real counts as metaphysics, then the word means nothing at all, which is my point.
What's left
Strip away the questions that are really about word use, and the questions physics eventually answers, and the working assumptions physicists themselves own and revise. What remains are questions that, by their defenders' own admission, no observation could ever settle.
A question no possible observation could ever settle is not a profound question. It is noise.
What to do with philosophy departments
If 2,500 years of metaphysics produced not a single achievement of its own, it is not just a dead area of investigation. It is baloney, and it should be rejected.
The usual defense is that philosophy departments have had some wins. Fine. But a few results that were later converted into science do not change the fact that most of what these departments produce is bullshit. So here is a compromise: close most philosophy departments and keep philosophy of science, the one branch that actually works with how we know things.
What about logic? Logic is no longer a philosophers' field. Kurt Gödel took it from them, and we never gave it back. It lives in mathematics and computer science now.
Someone will point out that Gödel himself was a committed metaphysician who believed numbers exist in a non-physical realm. So what? Newton was an alchemist. Great scientists have sidelines, and we judge them by the work that holds up, not by their hobbies. Gödel's metaphysics earns metaphysics no more credit than Newton's alchemy earns alchemy.
Conclusion
I asked for one triumph. I got a puzzle about planks, a wrong guess about atoms, and a relabeling of physics. Every time metaphysics produces something useful, it turns out to be physics. Everything else is just talk.
Metaphysics is shit.