But they’re not flexible enough, afaik (and you seem to know more so please correct me if I’m wrong) you can’t move virtual desktops from one monitor to another or choose whether each monitor should have their own set, or even choose whether you switch virtual desktops on only one or all monitors at a time. Which is why I specified as “that actually work” because the ones that exist work in only one way, so if you’re okay with that great but if not it’s the same as not having them.