If you came here to point out how content negotiation isn't a "trick" but rather a simple basic part of the core protocol: think first on the fact that there was once a time when you didn't know that.
These are really stylistic complaints; the author expressed themselves in a way that's not to your taste. Your tastes are valid, but there should be no expectation that every or any article will cater to them, and their not doing so isn't a criticism of the article and isn't something we can really have a productive discussion about in this medium. I find people use the term "clickbait" to try and reframe their tastes as something more objective.