Actually the one that really bugs me is that “User view” is not actually a thing in that it’s not a view mode you can switch back to with a command. So if you’re a noob and you see that colorful navigation gizmo, and you click one of those inviting little axis dots, you get put in some orthogonal top/right/front view with no obvious way to “get back to where you were”. “Just rotate out of it” is hardly something we can expect people to try (AFAIK there’s no other program that would work in other than Blender).
Camera view is magically a toggle that saves the view state and restores it if you click it twice, but no other view seems to behave like that.
I would propose that any view navigation command that is going to leave User view for something else should save the User view state, and there should be a command to restore that last-saved view. So if I switch to front view from user perspective view, I could then just hit a key (I like Backspace myself) to return to the previous view when I’m done.
Unless there’s some way of accomplishing this today that I’m just not aware of.