Back in the day, I used to distro hop, window manager hop and try to find the ever eluding "perfect" setup. This lasted maybe 15 years. There was a sense of vanity in trying to be different yet spectacular. Today I would tell my younger self that use what makes you productive. Even if it is the standard Windows or Mac OS environments. R/unixporn is the nerds equivalent of shirtless beach dudes.
My problem is that I was pretty productive with Ubuntu + Unity, significantly more than with Windows or MacOS, or other Linux DEs. This was great because Unity was the default DE for one of the most common Linux distros, so it was well-supported and easy to find information about tweaks and settings online. But then it got killed off due to a vocal minority constantly complaining about it, and now I'm trying to find…
Did you try Plasma? You can drag a window while holding the Win key, there are tons of keyboard navigation, and your last point can be achieved by this extension: https://github.com/Zren/plasma-hud. There is even some global themes with the look of Unity.