MacOS has a built in 4x4 window tiling which works for this purpose for me. I don’t find ever wanting more than 4 windows open on an ultrawide. Definitely not as powerful as something like xmonad but useful for the majority of my use cases.
Windows also has this kind of tiling built-in. It even comes with default keyboard shortcuts.
Windows also has this kind of tiling built-in. It even comes with default keyboard shortcuts.