But in the midst of their opinion, they raise awareness to a point not much talked in the tutorials or other material I've seen about Phoenix: it might seem easy, but has it's drawbacks. Drawbacks which could be easily avoided by power users, but might not seem obvious to a newcomer. That's it. The rest is description of such drawbacks, from the poster's perspective.
I find this informative because it is information that I haven't seen anywhere else. Not in tutorials, not in presentations, not in any other place I've seen people talking about the subject.
Of course after thinking for a while it becomes obvious that a framework built on such a "different" platform with it's own unique patterns and quirks would of course fit such a description. Any tech could, depending where you're coming from. That's OK. And it is also OK that enthusiasts of any tech would not present themselves in such a harsh way. It's all good.