Plasma has very strong opinions about what the desktop is. So strong that it probably disagrees with every single person.
The other side of the news is that the desktop abstraction has been made more and more useless on every OS for a couple of decades already. In any other OS your life will only improve if you abandon it too.
Had classical Android the option to arrange virtual desktops in (practical) 3 by 3 to 5 by 5 grids, and mostly tile the apps fullscreen across that grid?
That option existed in Windows, too. Only you needed to press CTRL, shift, or whatever to make it appear, instead of whatever was the default, which I've forgotten, meanwhile.
Maybe because the start menu equivalent and the task bar are their own modules. They just come precondition, but you can use lots of alternatives. But I'm just guessing.