Did anyone else notice how repetitive this was. He basically took an entire page to say, I can blow stuff up, build bridges, am a capable artist/architect. I guess even Da Vinci needed to add some fluff.
In a lot of cultures, being concise is not a virtue. Eloquence is valued, and demonstrating a facility with words is a marker of status. Using a lot of words to describe something shows the amount of attention or value you give to it. So spending a long time and a lot of big words on his accomplishments is an indicator of how cool they are.