I have a particular disdain for the profanity-laden slop that is works penned by Mark Manson. He's not alone as most "self-help" books are trash reads that only serve as some form of cathartic release to their readers.
That's not to say all books in the genre are useless. I have recommended Cal Newport's works before but they very much suffer from "this 300 page book could have been a blog post" levels of verbosity.
The need to sell, forces one to be as weird and vulgar as possible. Most books are selling focused. Selling has spoiled many art forms. The extreme antics you see on stage for a music show has nothing to do with music either.
A huge amount of nonfiction work is overlong. Many nonfiction works could be condensed to an essay or even just a blurb.
A wasted opportunity to explore related ideas.