To be fair, this doesn't really show/tell the full picture. This only happens if you were to scroll all the categories over; but even then, I'm having a hard time making things look unreadable on my iPad.
Here's what the sidebar looks like when you open the Music app or go to a different screen...there's nothing behind it. I'm usually interacting with the sidebar right away, or scrolling the categories. I rarely do both at once.
When I scroll the categories over, I'm still able to see and read everything. Btw, this only applies to the Home, New, and Radio screens. You can't scroll anything behind the sidebar on the other screens, so they look similar to above.
If you still don't like it, turn on Reduce Transparency. Remember, this setting can be applied on a per-app basis. So if you don't want it turned on everywhere, you can just turn it on for the Music app, for example.
Long story short, you can't really just go by screenshots; it's better to experience it yourself before deciding if you like it or not. I've noticed that some screenshots of Liquid Glass can look busy or overwhelming, but somehow look fine in real life. I don't know how to explain that...maybe something to do with HDR not coming over in the screenshots, so they don't look as vibrant or contrasty than they actually are.
