A nice article looking at how theories are formed that supplant other theories. How the earlier theory is not wrong, in that it works as well as it ever did, but that the new theory, in general, extends the old theory into realms where it did not work.
Often times we still use the old theory within the limits of it’s accuracy, because it is good enough and easier to use. Newtonian mechanics is one example of this. Einstein’s laws of gravity and motion are better, but in the realm that most of us live and work, Newton’s laws are good enough and much easier to understand and solve.