The purpose is to un-convince people from using it. Way too often people have already made up their mind by the time they reach the docs, based purely on how popular the tool is, how flashy the front page is, or whatever bad advice they've received from someone who feels the need to justify their library of choice.
For sure! Doesn't mean we shouldn't strive to give them a helping hand though. I know I fell victim to the exact same problem when I was learning front-end dev. I'm sure everyone in that space has had a "why on earth have I been using this for the past 6 months?" moment for one library or another. I just feel like we should be taking more preventative measures against that.
