BaZi is based on centuries of pattern recognition, not laboratory experiments. It's a descriptive system, like psychology — it doesn't claim to be a hard science, and doesn't need to be one to be useful.
What BaZi offers is statistical correlation observed over generations: people born under certain elemental combinations tend to exhibit similar temperaments, face similar timing patterns, and respond to similar remedies. Modern practitioners have validated this through thousands of case studies.
Think of it like meteorology before satellites — not every prediction is perfect, but the overall climate reading is remarkably reliable. The best evidence is personal: run your chart, observe your Luck Cycles, and see if the timing resonates with your actual life experience.