But it takes skill to use the pistol, too. You still don't have one and I do. How is that fair to you when all you have is a sword?
Whether it's practical isn't the issue, though. Is it fair and honorable? A large number of Nords decided 'no,' and that's how we got the Civil War. (Also, the dragons hadn't even entered the equation at the time of the duel. Though since we're on the topic...remember Alduin lost a lot of street cred with the other dragons when HE tried to use something he had and you didn't to win your fight with him--namely the fact that he's immortal. Also also...how can you say non-canonical when it's in the game? Arngeir gives you a whole speech on the subject when you first show up. )
Kynareth, the one they're worshiping with these shouts, was originally a storm goddess and goddess of warriors.