The top comment read (to me) as critical of the post, by implying that it was any easy thing to think of, and that maybe the author should have tried building a phone instead if they were so smart.

But as for "agreeing loudly" , I love the term never heard that before. Its definitely something I notice myself and my friends do and stop the discussion when I can. My guess is that it usually starts with some sort of misunderstanding and kinda spirals from there, but also interested to hear thoughts!