With ultrawide displays we need an update of this paradigm. Maybe we need to introduce the concept of areas on a display that partially take over the role of a physical screen.

For starters I have just adjusted my MATE desktop to vertically maximise the window on double clicking the titlebar.

With it you can hold Shift when moving a window, and the window will snap to a predefined grid. There are also other nice tools, like a Color picker when you press Win+C.