A level of epistemic humility seems to me to be a baseline requirement for long-term success in science and engineering. I would also contend that it's a useful quality socially, but primarily when it's shared between interacting parties. If one party believes that perfect knowledge/memory is possible and regularly held by themselves, while the other believes they're both fallible, the clash between these worldviews can easily lead to conflicts in which one believes with certainty that the other said something they probably didn't say and certainly don't remember saying.

anyway, I'm arguing with my girlfriend. it's a pain