I've used work profiles too. Together, that gives you a total of three installs of an app, all with strange (and different) interactions and limitations between them. All of which is quite different than you'd expect for a "let me have two of this app" feature (because it isn't one, though it's frequently propped up like it is).
Again, you're confirming that you don't understand the features. First you complain about Private Spaces locking, and now you're legitimately complaining about having to install an app twice? A) you don't and B) the segmentation is the entire point.
No... I'm saying that they don't let me install it an arbitrary number of times, and none of them are "normal" additional installs. They come with weird restrictions and extra complications that are wholly undesirable for many situations.
Those restrictions can exist too, and e.g. work profiles are obviously useful. But it's strange that we don't have an option that isn't restricted like that.