While messaging another user (on my wiki which is UCP-migrated) I noticed that basic wikitext functions, like <nowiki> or [[linking]] no longer work on my wiki. Is there a way to re-enable these functions on message walls?
Bruh that is very disappointing. hopefully they change them soon, my wiki used to use templates and such on message walls for community things but none of them function properly now.
Get used to the reduced functionality. UCP is designed for FANDOM the company's benefit and with few benefits for users. The last major re-architecting of FANDOM wikis back when it was called Wikia was called Oasis and although it drove away many major wikis from Wikia, it was 1000% more clean and bug-free compared to UCP. FANDOM is depending on most users not being around to remember.
That isn't entirely true. The new discussion features are redesigned for mobile, casual, and new users as much as they are for Fandom. The lack of wikitext support is only an issue for more experienced users and older wikis that have gotten into the habit of using it. Of course, none of this information is new from what it was over 4 years ago when Discussions first came out.