The point isn't whether or not we listen to the music while logging in, which I admittedly do. The point is that Riot is giving up a unique and universally-loved part of the game, and it's only getting more and more lackluster as it dies. This means that, not only is potential being wasted in half-done animations like Dark Star Jhin's or even Battle Academia's (and let's not even get into the poorly-cut cinematic loop for the Project login), but potential is even being wasted in the music as well. The Dark Star and Project themes were disappointing remixes of the two most beloved themes in the game, Battle Academia had no theme at all, and even as early as Galaxy Slayer Zed's theme, it's clear that Riot didn't give it their all.
This isn't universal; I think the Arcade animation and music were sufficient, Pantheon's actual music was excellently done, and the upcoming Star Guardian music sounds nice enough. But it's wasted potential and fizzling out instead of ending on a bang. And this disappoints me even more than the ending of login screens in general, though that makes me sad too.