An essay of this length should communicate something that is not necessarily digestible into a single point. In fact, it's arguable that a good essay cannot be summarized into a single point, and that the entire article needs to be taken as a whole before the full nuance of what it's attempting to convey can be understood. Sometimes "the point" is difficult to articulate and that, in my opinion, is something to be desired across all artistic forms.
I see this sort of criticism on the internet very often, as if people expect writers to create digestible, elementary essays that they can only vaguely engage with and still walk away with something to agree or disagree with. Personally, I demand more of both the writing I read on the internet, as well as myself.
Not to defend this particular essay too hard, but the conclusion does the exact opposite of recommend another self help book. Literally the final paragraph is the shrugging off of self-help books entirely.