What I've always found strange about Stage Manager, and this might totally be a "me" thing-- is that it encourages windows overlapping with each other.
I use Magnet on macOS for example, and I love it for the reason that I can make sure the windows I'm using are lined up perfectly, never overlapping. If overlap causes some information to be obscured, it defeats the entire purpose, since I'd have to tab to the corresponding window or click on it to view what I need.
Raises the question of SM on iPad, when the current multi-app offering, while not ideal or the best, allows full view of the two apps in use.
So strange that this feature has been having as many problems as has been reported. Doesn't feel like that big a deal, software-wise...