It's been good enough for 40 + years. That is not the question. The question is when will you stop trying to make it better? Since the room won't change, I'm pretty much just making my records better by getting better pressings/remasters. Replacing styli or the cartridge is all I worry about now after treating for vibrations.
How good is good enough?
Most of us here cannot afford six figure prices for each component (assuming that will bring the best sound.) So how far do we want to go to improve our systems? There are always bigger fish. When does it stop? It stops when we say it stops, when our gear brings us satisfaction. To constantly strive for better sound is an endless quest, not necessarily based on the quality of our set but on our personality.