I felt like that when I was in halatali as a cnj with my friend as an acn.
When we got to the first boss, she wasn't even dealing with the adds. "oh but i was, my carby was on it".
Yeah, sure for the first add, after that he went straight back to attacking the boss. I had to completely drop heals to deal with it because nobody was.
The whole run was annoying because I just dps'd. I felt unneeded.