User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-172.56.22.229-20201112191025/@comment-24006128-20201112192420

The bouncing editor is being worked on.

Performance fixes have been ongoing for a month now.

Chat didn't make the jump because it was poorly used, even on wikis which claim to use it all the time. Yes, I checked.

Comments and message walls were built on custom modifications to the core MediaWiki install, which - in part - caused legacy to not be updateable to modern MediaWiki versions in a reasonable manner.