Agreeability is essential for functioning in a group at any scale. There has to be things that the majority of people don't care to argue about. The courage to stand against the agreeable group for things you do care about isn't the temperament trait disagreeability, it's integrity.
Discussion
Yes exactly!
Generally, philosophically, I agree with you. However, I’m referring to the psychological definition and, unfortunately, this is not how psychological tests are constructed. The construct of agreeableness is a little different there. Since they’re looking for general tendencies and not for case sensitive reactions (that would be integrity) most of what you call integrity will most likely show in psychological tests as lowered agreeableness. It’s not a problem except for its bad framing. Content wise it’s overlapping to a huge degree.