If you want automatic tiling, there are Kwin scripts for that eg https://github.com/anametologin/krohnkite/

Essentially turning kwin into a tiling WM

It's not even the tiling so much, but the ability to move directionally between windows using super+hjkl or whatever, that's the killer for me. The big DEs like KDE and GNOME can technically tile but you're still stuck with alt-tab to switch windows which is horrible.

That's why I wrote this: https://github.com/cout/windowfocus

I bind Alt+Shift+H to run "windowfocus left", which figures out which window is "to the left" based on some heuristics such as the direction between the center of the active window and the other windows on the screen. Since it works uses the center of the window, it works with overlapping windows (but intentionally excludes windows that are occluded).

I've used it in both xfce and kde (though not recently).

KDE's meta alt arrow doesn't exclude occluded windows, but if you're tiling you probably don't have those

Alt+Tab is great... I wouldn't use a desktop without proper Alt+Tab (exactly like in KDE).

meta-alt-up/left/down-right by default on KDE.