Frankly Stage Manager just strikes me as a rather cheap trick as one can minimise one's apps, have multipile desktops, have muiltiple monitors, have a headache working out which of the 57 ways one shoved the 15 apps one is using off to the bottom, the left, the right, to top, or the centre . . .
I mean, if you haven't worked out how to manage your workflow (something I worked out in Mac OS 7.1 and so on)
by now what possible extra something is Stage Manager going to give you; after all, the 'problem' (if it is a problem at all) is either in your head or in your "Paris Hiltons". 😛