Actually, I've used PaperWM for a bit (a Gnome Shell extension), and that one puts windows next to each other and scrolls left and right between them. (Each window is full height but not necessarily full width.) I find that very nice.

For example, I could have a 2/3 window on the left and parts of another 2/3 window on the right, and going from the left to the right window then scrolls 1/3 so that the full right window is visible.

Pretty cool, actually.

I will want to try Material Shell, too.