Using just resizing as an example: there are no visual queues you can resize any macosx window without hovering over an edge; the edge is visually 0 pixels wide

Using just resizing as an example: there are no visual queues you can resize any macosx window without hovering over an edge; the edge is visually 0 pixels wide; the resizable area extends outward from the window a few pixels which means you're clicking on the window underneath to resize the top most window (unless it is near the edge of the window underneath, then all bets are off); The resize cursor is unreliable, sometimes it does not show but clicking and dragging do resize the window; resizable windows are visually indistinguishable from nonresizable windows, and the same relative pixel that resizes one window either moves the nonreziable window or brings forward the window underneath.