> just try to find your windows after you remove a second monitor for example (this is a pretty common use-case for laptop users in work environments).
Do "standard" WMs still do the one-desktop-for-all-monitors thing? One workspace per monitor (over a shared set of workspaces) works much better IMO (even if it isn't the default, for more experienced users, it can be quite nice). The main downside is keeping track of what is where and the keybindings to do different things.