The problem is, the OS is very limiting. The file manager of iOS is extremely dumbed down, even Firefox doesn't work properly on it, and desktop mode with stage manager is just stupid. So yeah, it's not a success so far.
Android though feels more open, so I would give it a try of their desktop mode isn't stupid. Firefox on Android is fully functional at least and that's a great start!
But, more broadly, the problem is that they can do it for their own apps, but for all the third party ones, it's down to app developers whether they want to put in effort to support keyboard & mouse/trackpad properly. And it's a chicken and egg thing there - relatively few users use it currently, so there's little motivation to add support, which deters more potential users.
Funnily enough Windows is the closest to get this right with 2-in-1 tablet/laptops. 2 problems with this: 1- Windows, 2- sub-par HW.