It is essentially “don’t roll your own crypto”, but instead being screeds of complexity it just highlights a few very basic and simple things that seem “obviously fine” to folk that are unfamiliar (eg doesn’t touch on any complex reasons for it being bad, and doesn’t just say “you’re stupid”). It then gives examples of these basic problems causing real world failures, and it then just says “this is what you should use instead”.

Eg it’s very to-the-point, doesn’t spend all its time talking about how the professionals are awesome and better than you, and gives actionable recommendations. Most “don’t roll your own crypto” articles don’t do that and just come off as being elitist, and don’t actually _help_ the reader.