Interesting! The active project (rewrite) moved here apparently:
https://github.com/koekeishiya/yabaiJust to piggyback on your interest:
My comments were more in the way of evangelizing Plasma (iirc KDE is the company, Plasma is their DE product), to share awesome features that I'd love to see generalized on all platforms.
In searching for a productive DE, provided you only want GUI config on the user side and can learn to juggle between 3-4 settings panels, Plasma beats them all.
Defaults are very close to Windows 10 (rather the other way around historically but whatever), with a touch of Linux twist here and there (magnet sides, feature-rich title bar menu, etc.)
The more advanced stuff is only necessary to maximize X (real estate, aesthetics, shortcut-driven controls...), some of it becomes invaluable over time.
I strongly encourage you to spend some time with KDE's Plasma, it's inspiring regarding the 'desktop paradigm' insofar as we just want to refine, not disrupt it (familiarity is a good thing for users imho).