E;R's latest Whorra video and his comments about Tenzin reminds me of how modern Western writing, with its girl power Mary Sues, completely screws over traditional Mentor characters. Obviously a Fucking White Male has nothing to really teach a Strong Independent Woman, so instead of taking up what *should* be his role, the would-be-mentor character instead ends up portrayed as an out-of-touch loser, or a bitter, broken failure of a man, who of course has to be saved by the Mary Sue.
Contrast this with Shulk and Rex in Xenoblade 3 Future Redeemed, who actually ARE allowed to become the leaders and mentors you'd reasonably expect them to be. Not perfect or all-knowing, but still genuine great and good men possessing lots of special knowledge, who the younger characters learn a lot from.