Agreed, it’s rather well done.
Interesting thing though:
I already use the mouse very little, and use a little Gnome extension to do very basic window resizing and positioning.
Using Regolith changed my mouse usage almost not at all, but required a lot more typing. I actually felt quite flustered by it.
It’s possible a couple of months wasn’t long enough to really appreciate it, so YMMV. As I say, it’s quite nicely done: an Ubuntu base, using i3 for window management, but retaining all the Gnome settings/configuration stuff.