I think I may try out Fedora Kinoite then. I was starting to monkey patch GNOME 40 to make it behave better for HTPC use, but the update to GNOME 41 has already demonstrated that it's too complex to maintain extensions in that ecosystem. I hardly interact with my HTPC so it's not that big of deal for me, I just need something that is capable of dedicating a "second" monitor (my primary monitor is a dummy plug display that I remote desktop into) to Theater View without interrupting playback.
The "zooming" I'm referring to has been the design of GNOME since version 40. They've decided to assign each display its own activities overview (a GNOME concept) and the Super key activates all of them simultaneously. This makes perfect since for a workstation but not for a HTPC, where I want to interact with the machine using remote desktop on the primary display without disturbing Theater View or whatever is playing on the second display (TV).
Coincidentally, when I last tried KDE in a VM I could never seem to get remote desktop to work at all on Wayland so I'm glad to hear it works for you. I basically just need to be able to control the MC interface remotely, so as long as that works I'm golden.