I genuinely think that having the covenant combat abilities be usable in raids/dungeons but not the utility abilities is the way to go. Aside from what I mentioned there aren't really that many positive applications of the two abilities in endgame content, moreso they would fuck it up by ruining M+ for anyone that wants to be Kyrian/Necrolord. While some players may complain that they're slower in instanced content that is much better than them being weaker.