In my experience when people reset their password and then cannot log in, the majority reaction isn't necessarily
"Oh dear, I reset my password incorrectly, I better do it again."
"Why wont this stupid website accept my password, I'd best contact support!"
Websites started asking for passwords to be re-entered for this very reason, it cuts down on support. If you wanted to say its not an issue on QT3 because we're all smart and good looking, I wouldn't necessarily argue with that. As a general feature for Discourse though, I think its worthwhile at least as an option.