This actually doesn’t work with modern expectations.

Modern games are expected to work in multi-monitor setups and render in “borderless windowed” mode, so you can alt-tab out to multitask, or have a comms overlay. Single monitor single process gaming still happens, but a good 85% of setups (according to the Steam Hardware Survey) are not that. There are five games I know or that actually handle multimonitor natively of the hundreds I’ve played. So we need some form of cooperative multitasking for graphics with the window manager.

Modern good games are not expected to "render in “borderless windowed” mode, so you can alt-tab out to multitask"

Really bad games with slow multiplayer match making lobby and tiresome repetitive gameplay and bad UX where you need to look most of the actual game information on a fan wiki, or triple A games where you have to login and enter credit card information on a "launcher"... those are the ones you expect to "render in “borderless windowed” mode, so you can alt-tab out to multitask". Good riddance.