It's interesting, I know a few early twenties startup founders (plus just a lot of college aged people) and very few have the arrogance that you claim to have had. In fact most follow the majority of your advice without having read your post, although that doesn't make it any less valid.

But what I'm really trying to ask, is I'm wondering if in ten years the maturity of the average young founder has changed. Are the people who start tech startups at 21 a different type of people than those who started them in the previous bubble? What changed? Where did the arrogance go? Or am I just hanging out with the wrong crowd?