I don't know if Garmin will respond here, but there have been users here who have stated they prefer the Modern version. Whatever your views I get the impression Modern is here to stay. Personally I like it :)
I am quite prepared to accept that for style reasons Garmin want to replace the classic connect. what seems a real shame is that in the process they lose functionality from the earlier version in the same way that they did for the move from Training Centre to Connect. Most of that functionality should be very simple to carry over.