I actually noticed back in my days at university that the academics who used "I" in their talks instead of "we" or "one" tended to be a complete waste of attention (with very few exceptions). May or may not be related.
Completely related.
Blowhards that are haughty and full of themselves. They overestimate their own intellect, skills, and importance in the world.
Deep down inside they are completely insecure and miserable.
This was my experience as well. As a student it wasn't even possible to ask questions in a friendly discourse without seeing those people heavily offended due to their lack of an answer. Meanwhile the "we/one" camp just either outright said they had no obvious answer or at least tried to provide some possible angles to tackle the questions from, while clearly indicating that they aren't sure. And here I used to believe that university was about honest intellectual discourse before I got there, but oh well.