Several of the subreddits I mod make extensive use of CSS decorations. It's simply impossible to construct anything similar with the redesign. There are also so many missing or broken features that are in a state of flux it's hardly worthwhile to put forth a lot of effort attempting to do so.

Moreover watching the traffic stats it's clear that the majority of users access Reddit in the communities I care for do so through mobile apps where not only is it impossible to do nearly any form of differentiation, it's difficult to communicate community standards or other info, like FAQs to casual users.

So currently the most functional user interface that can effectively communicate all features available to communities is the old desktop one, which by design is now the least used. It's a farcical disaster.