So Independent Mode is very similar to "classic" Exercism.
I'm defining "feedback" really as (1) - so there are 5x more comments (from mentors + public) now than there were in old Exercism (public).
So for a tangible example: - Feb 1st 2018 (classic): 162 comments, 110 stars - Feb 1st 2019 (new): 831 comments, 46 stars
I randomly picked that date, but every date is basically the same sort of ratio.
Lots of people say the same as you do that it feels like there's less interaction, but really there's a lot more. I feel like we're failing to make Exercism feel as alive as it actually is for some reason, but I'm not sure why :)