Agreed, although hovering over the green window button gives you the option to put 2 windows side by side in full screen, and option+ hovering the option to put them side by side without going full screen.

Still a far cry from Win10, where it’s automatic by dragging to the side of the screen, where you have quarters, hotkeys, auto resize etc.

I've used https://www.spectacleapp.com/ for a few years to split windows on osx

I used Spectacle for a while, and recently switched to Amethyst. It works very well, but it would be nice if there were at least basic functionality built in.

I wasn't a fan, it seemed really laggy to me when I used it