Most often if a theory gets replaced, it actually gets expounded upon, fixing the edge cases where the old theory didn’t work.
Newton works at “normal speeds” but doesn’t work when things move really fast, so Einstein fixed that with relativity, and quantum mechanics expounded on Einstein.
But the older theories remain valid in their domains.
That’s why when building a bridge you use Newton and not relativity or quantum mechanics.
Neither Newton nor Relativity were wrong. They just don’t explain absolutely everything.
Most often if a theory gets replaced, it actually gets expounded upon, fixing the edge cases where the old theory didn’t work.
Newton works at “normal speeds” but doesn’t work when things move really fast, so Einstein fixed that with relativity, and quantum mechanics expounded on Einstein.
But the older theories remain valid in their domains.
That’s why when building a bridge you use Newton and not relativity or quantum mechanics.
Neither Newton nor Relativity were wrong. They just don’t explain absolutely everything.