Wanting to pin a floating window was always something I wanted on Windows, so I was excited to see that being natively supported by KDE.
Agree on disliking alt-tab because it’s non-deterministic! Cycling through a whole list of apps has always felt clunky to me so I never use it.
Using it to separate work from other uses makes sense to me - I think if I worked from my desktop rather than the company laptop, I’d be more inclined to use the virtual desktops.