Because unlike many I've actually been keeping tabs since I started. I always take note of who's wearing a crown when I enter content and what people say. Have been doing it since the first couple of months I started playing, 3+ years ago now since I saw a similar post back then and was questioning whether or not I wanted to enter the program. I've played with a good thousand (and that's an underestimation, more like thousands since it was probably around a thousand by the time I even qualified for mentorship 2 years ago) of mentors in that period and the VAST VAST VAST majority of mentors are just silent in content. They don't say anything unless someone asks or there's an obvious issue in the content being run. The reason for this is that often times if you ask others if they want advice they will just say no.
It's absolutely ignorant and ridiculous to claim that a majority of mentors are an issue as many of the people complaining in here or other posts/threads are doing. Full stop.
Survivor bias on this one is strong. People complain about mentors standing in aoes and playing poorly as if mentors aren't allowed to learn new jobs and tunnel vision like everyone else. People complain about players becoming mentors for the crown like there's some kind of correlation between that and being a terrible toxic (to quote others) mentor. Completely unrelated.
Yes there might be some NN with a base of bad mentors on some server that I may not know of, yes there are definitely some mentors that should be stripped of their title. I've witnessed only a handful myself but willing to concede my experience on aether may be a little better than others (little being the key word since I doubt any delta would be significantly wide, though euro servers with diff languages may have it differently). But anyone claiming a majority of mentors are bad, or claiming that the mentor system is full of toxicity should not be taken seriously. And that's a good chunk of people complaining.
Not saying the game wouldn't benefit from a change. Just saying people need to stop crying wolf.