I mean, you are more than welcome to share a subjective opinion. "In-depth" in this context means actual relevant content and not a few lines of text. Yeah, sure, one-liners are great and I myself have to Google them all the time because I forget the different variables that shorthand's can take, but W3Schools is on another level when it comes to this.
They inherited their authority from a time when content on the web was sparse and thin as a rail. The argument here is not that they don't provide _any_ useful information, the argument is that the inherited authority is making them first results for queries were they obviously should not be first.