True enough, but in that scenario, they aren't any worse than the current mentors.
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You seem to be missing the point people trying to convey to you. Mentors mainly deal with people who're new or returning, neither of which are going to be raiding.
Besides say if a mentor has first clear in ultimate on their main but are a mentor on their alt, should they be left out or how would you determine whether they're "mentor material" or not. Then of course we have say someone who cleared all the coils when they were current but got burnt out or doesn't have time to raid as much so sticks to regular content, should they be left out of being a mentor because they're not up on current hard content?
For example i'm a decent healer and can usually keep my party alive in most situations but I suck with timing, I just don't work well while under pressure to perform, i'm also bad at explaining things and for that reason I've never bothered becoming a mentor, even tho I could easily do so if I leveled a tank on my miqo'te or had the dungeons cleared on this character.
In short mentors need to be able to clearly instruct others, they need to yes know the game, but savage content doesn't imply that you know these things, but at the same time it doesn't exclude you from these things.