Alt-tab was my very last use-case because I literally have bindings to pull up my main programs.
As someone who has gone from tiling(i3), to floating (stump), to tiling again (i3/sway), and finally back to floating (awesome) - I can say floating wins in terms of predictability. You press a button to focus on your desired window and your entire desktop does not need to convulse to accommodate for it.
Floating window managers win on speed and predictability, and I’m wondering now if this is causing the rift in single/multi monitors in this discussion chain.