Comment by kmeisthax

You are correct that you can't lossily compress a vinyl, but you absolutely can master a vinyl for maximum loudness. It's harder to do, and some of the techniques are different, but it can be done, people did it, and this was actually where the loudness war started. And notably, unlike digital, vinyl does not impose a maximum loudness wall. If you find a way to make the groove wobble more than before, the player will absolutely produce a louder signal than before, whereas with digital you have a strict limit to your levels at +/-32768.

To make matters worse, people aren't doing separate masters for audiophile formats anymore, so vinyl is getting the ultra-compressed, low-dynamic-range master anyway. That is because the vast majority of people buying vinyl were doing so as merch, not so much as a way to buy better-mastered albums.