Of course not, but they usually don't do that. Vinyl guys normally have much better equipment to start with, so the engineers orient on much higher common denominator.
Also it's naturally much harder to cut something very loud and compressed onto the master lacquer. It's physically hard for playback too.
So the media itself is more demanding on the mastering quality, whereas CD would allow putting any garbage on it without any physical limitations....
Without any physical limitations? What exactly do you mean? To the best of my knowledge CDs as a physical media certainly have limitations.