People like ^ don't understand that not everyone has been playing the game since launch.
I understand this perfectly, thanks. Please don't put words in my mouth.

I do worry though as a mentor the content I enter I should be able to help with, since I can't help with lvl 50 ex primals so I avoid the roulette. I'm glad to hear there are people who do fine with them though when they get ex primals for mentor roullete its just not for me.
You are helping, by being there (at the max allowable item level too, which the new people in your party likely won't be)

Being a mentor doesn't mean you should know the ins and outs of every fight on the roulette by heart; that's a ridiculous expectation. What doesn't help encourage mentors is that some people literally do have this expectation.