> counter ... people may miss-click when trying to resize a window

That's a counter against another common sin of UI design that's stuck in the past, another superficially appealing idea that requires users hunting for tiny lines for common operations. That one should be fixed instead of making the scroll bar worse. (they even have that whole dedicated "windows" button that doesn't properly manage... windows)

Besides, lack of proper universal undo (that can undo selection/position changes, including windows) is yet another desktop UI design failure. Similarly to what you've noted, the solution to which is yet again fixing that instead of breaking useful functionality in other elements. So maybe it should be Win+Z to undo window resizing/moving?