I can't see any benefit really to this new feature they announced without what you're suggesting.
If they add the ability to collapse groups, then I would probably use it, otherwise I can keep my tabs just as organised without a need for some colour hints.
Same. I was really excited first when I saw this feature. After installing it, I barely use it now.
It helps a bit for a first overview, but my tab bar is still super full.
This would really help the "tab collecters" (like me, who had to close 78 tabs some weeks ago).