That's also present on countless window managers for X11 (Linux, BSD). What both Macs and Windows seem to lack is a modifier for holding to drag windows: most

That's also present on countless window managers for X11 (Linux, BSD). What both Macs and Windows seem to lack is a modifier for holding to drag windows: most X11 window managers let you hold Alt to drag windows, regardless of where you click. That would have saved me from several situations in Windows where the titlebar of a window is out of the viewable area, and I therefore could not move the window.