A "perfect" sound is hard to quantify. Fundamentally I'm not opposed to small sound tweaks in software updates as long as they make the sound experience better – you can love the way it sounds and still yearn for improvements. There are people who think that the iPhone X is a perfect phone, but do they want it not to receive anymore software updates because of that? No, of course not.
The problem here is that Apple tweaked the sound in a way that reportedly made it worse, it changed an excellent sound experience to something less excellent, at least that seems to be the general opinion. If Apple tweaked the sound in a way that made it better, then it wouldn't really upset anyone.