User blog comment:YirbFpYxzhXdxfk/Please do NOT turn certain communities into UCP!/@comment-5288784-20200815200913/@comment-5288784-20200818105328

At first glance it is a downgrade. But you really have to ask what are you using wikitext in comments for. Maybe instead of porting the whole wikitext parser for comments, it would be more efficient to implement just those commonly used stuff?