I know that is a strong statement; quit reading if you disagree, it’s about to get worse.
This is how someone might become a mentor. They watch a TED talk, let’s say Simon Sinek, and learn the golden circle, why, how, what. Maybe they also read a blog post, let’s say, “How to Implement OKRs in an Early-stage Company” from Brian Balfour. Then, all pumped up, they get out and teach young startups what they ‘think’ they have learned.
Worse yet, they don’t bother investing a lifetime in learning what others have conceptualized and go on with their certainties and mentor startups, solely based upon their convictions.