"Because the ability to just suck it up & get things done even when you don't enjoy every minute of it is a very important trait to have."

I think that this is true, but after four years of working hard at a demanding high school I was actually substantially less able to "suck it up and get things done." I don't know if that's because high school burnt me out or because I changed mentally during high school or something else, but it makes me a lot less willing to accept that forcing people to work hard on boring shit makes them more likely to work hard on other boring shit in the future.