So I'm the only the user of my computer, and I eventually figured out how to enable the "su" user on my account with a password (really quite simple actually), just in case I ever needed to do something where I would keep having to authenticate permission.
I have no fear of hackers because I'm such a discrete/boring internet user, but I was curious if enabling my su would make my computer more vulnerable to cyber attacks, or what your concerns would be if your computer contained more sensitive information or you had more of a reason to be paranoid.
Or do the Ubuntu makers just try to stop you from making a su account just to keep you from screwing up your computer?