I think the problem is that a lot of PKM articles are about _the PKM_, rather than the knowledge captured. Endless articles about 'hammers and chisels' in abstract, and not about 'woodworking', or how to use a chisel to accomplish a certain task during woodworking.
However, it's rare that I actually see articles talking about WHAT they capture. They never put the PKM into context. So again a lot of these articles feel like 'just take notes, DUH!'...and yes that's mainly what it comes down to. But with blog post after blog post, there seems to be so much added 'ceremony' to note taking. If there wasn't so much ceremony, one blog post would likely do. Adding all this ceremony just feels like you (the amorphous 'you') are trying to complicate the process so that you can monetise the solution.
If some of these articles explained their thought process about capture and organisation in a real world context, rather than just the abstract notion of 'tags are good', 'organisation is good', 'notes let you follow up on stuff later!', they wouldn't seem so vacuous.
I generally am also quite interested in PKM, and have maintained a git repo of markdown for the best part of a decade, augmented with pinboard and goodnotes for bookmarks and handwriting respectively. I've tried various tools such as evernote, obsidian, physical notebooks, zettelkasten, personally hosted wikis, tiddlywiki, trello, onenote, zenodo, mendeley etc over the years, and even wrote my own bookmarking solutions and CLI tools.