The most fascinating part of Buddhist metaphysics is how consistently people arrive at the same conclusions. This essay itself is proof — a guy in London today, who lives in an age saturated by information, had almost exactly the same thoughts as a guy 2500 years ago, who sat under a tree. On what other subject would that be true?
Imo the credit goes to the methodology. Well before the scientific method, meditation put repeatability and direct observation at its core. If the meditative experience is an experiment, it’s possibly the most consistent one in human history.