That’s because most of such “UX” articles are written by junior designers looking for a job (writing to promote themselves) or working in an IT services agency (writing to promote the agency).
These individuals tend not to have a whit of formal HCI education or real-world practice.
When you have little theoretical grounding and real world experience, all you have is examples from apps you spot in the wild to learn from. You don’t know what makes something work, and you have never seen it work yourself.
You might learn the wrong thing: that if some popular or financially-successful app out there has implemented a particular design pattern, that it must be a “best practice”.
It’s kind of like how most “how-to” articles, YouTube tutorials, and Udemy courses in software dev are made by junior devs.
