I very often use complex window layouts [1], not just side-by-side. The fact that I can ask my window manager to arrange them for me, in the way I want, without having to drag them, and without them ever overlapping, and without wasting screen space on useless window decorations, is something I'm just too used to to switch back to the way Windows would have me manually arrange and resize them.

[1] - https://q3k.org/u/96613e57e6d630e35c8872f2fe970331fa327cd501...