With the new interface, I need to wait for official mentors, and while some have been way above and beyond, the dearth of reactions from anyone for long periods can be a real downer. I preferred the semi-OK amateur mentorship over the wildly inconsistent/non-existent mentor assistance.
There was one mentor that I would have happily paid directly to keep giving me feedback, but there was no mechanism in exercism for me to make that offer, even if exercism took a cut.
Also in the old interface, the community solutions were sorted by recency, so it was easier to interact with other fellow learners, and the new interface is not that, I'm not sure what the order is, but it's of no use for me to comment on a piece of code submitted two years ago.