Oh, they do. My point is that most vinyl was not well engineered, from eccentric centre holes to warped platters, producing wow and flutter. An LP degrades on every playing, and the higher the crescendos, the worse the 'planing' effect of the stylus. Dynamic range was always limited by the medium, so, for example, Verdi's Requiem was always highly compressed to make it 'fit' the vinyl. Finally, stereo separation, cross-talk, was really very low, again due to the mechanics of the system.
Some music was not hugely affected by the limitation, and some labels, eg Sheffield Labs, took a lot more care with their pressings. Overall, though, CD is technically superior - it just sounds different.