I had a go. Nice work. Two minor irritations I thought it would help with, but it didn't:

- Lots of iTerm shells open: easy to access, but iTerm’s window titles don't make it easy to find the one I want, and neither does this

- (the big one) Lots of browser windows each with multiple tabs make it hard to find the tab you want if it's not at the front of the window it's in. Would be more compelling if there were a way for it to look inside (eg,) Brave and represent each tab as a window

Otherwise: some lag in updating thumbnails occasionally confusing; it doesn't seem to do anything clever to cope when things spill off the right-hand end (eg, good time to group by app if you weren't already); quitting did not bring the dock back, as claimed.