Oh yeah! I forgot all about that tab colouring bit inside the tabs. Do you also remeber you didn’t have to scroll over the address bar to easily click on a tab? 
One thing I’d like to emphasise that many users sort of seem to have forgotten and should realise, is that lets not forget, the older Muon (Electron fork) had a hell-of-a-lot of issues. Some pivotal (non security) ones that were backlogged for over a year which the new Brave-Core (Chromium fork) automatically fixed and there were many more that many of us wouldn’t be able appreciate that were also fixed in this transition.
Nevertheless, here are some other similar issues posted with replies from a senior member that would alleviate many users concerns about the classy Muon version.