I still want macOS to "borrow" (Read: steal) window snapping from Windows. The mere existence of MultiView on Apple TV gives me hope that someone is at least thinking about how to implement such a system.
Have you tried Magnet[1] yet? I’ve been using it for years and really love it. TBH, I prefer it over way Windows does it (forcing you to decide wha goes in the “other” side of the screen).
magnet's keybindings for me are the best defaults—they are very intuitive, and don't conflict with emacs. rectangle is an alternative i've tried, but magnet is the one for me.
BetterSnapTool is the first thing I install on macOS.