Not all snakes are designed to be slim either. A cornsnake would look anemic next to a burmese in good flesh.
Balls are slimmer than burmese in looks, and they will not get 10 feet long. That's why I love ball pythons so much! I can't handle a 14 foot snake here by myself, but my ball pythons won't ever grow too big for me to handle!
Congrats on your ball python!
Wolfy