Calling out non-professionalism and bashing a stranger's communication style are, perhaps ironically, nice examples of non-professional behavior.

I would answer your rhetorical questions with an emphatic "no." People's emotions and mental state are important. It's also important that we communicate, understand, and think about people's interior worlds.

Question for you: What else is Linus communicating with his writing style? Does he show that he cares? About what? What can we tell about his values? Are these values we want in a leader?

Sometimes it's good to take off the prescriptivist hat and try on Honest Curiosity.