Earlier quoted context omitted.
Who are these people? I absolutely hate fullscreen in macOS and literally only use it for fullscreen videos and the like. What part of the window doesn't work well?
Snapping/alignment, gesture. The alignment, it don't even support snapping, place two windows side by side properly is just like impossible, and the + on window go fullscreen unless you hold opt. You can't just swipe to switch between window. You can only swipe between desktop. I'd wonder which part in mac's window manager actually works well (compares to other desktop manager)?
Like macOS by default might not be exactly fitting for everyone, but surely it works well enough for 99.999% of the population.
And coming from Linux users who love customizability... I mean there are multiple ways to make it work exactly as you want. I have snapping, and multiple gestures to position and resize exactly to my liking, through BetterTouchTool. And I am a very light user.