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The "soft sciences" are harder (more difficult) to do than the "hard" sciences in many ways.
Less evidence just laying about just waiting to be tested (archaeology, ancient history), non-deterministic subjects (humans), not easily reproducible environments (society). Quantum mechanics has it easy in comparison.
Is it any surprise that the consensus goes back and form a few times.
Even when the hard scientists have something 'simple' to study like the deterministic, macro-scale universe they still get it wrong: how long was the Big Bang Theory not taking seriously?