I'll take competent or amazing with some annoying personality quirks over incompetent and highly likeable any day of the week.
The latter might be fun for chatting during a coffee break, but they consume resources while providing little of value which ultimately means more work for you.
This is the 100x Dev myth, and straw man that devs are either 100x or -100x.
As it turns out most devs are somewhere between 0.8x-1.2x. With a few 2x and 0x outliers. In many roles a 0.8x who plays well with others is vastly preferable to a 1.2x who cannot work as part of a team.
Unless you are at the most prestigious, high paying, selective firm.. then maybe you have possibly higher performing people, but by your selection process they will also be clustered themselves.. just on a different range of the band.
Agree, I've worked with one.
It may cap out at like -0.5x or -1x.
Anyway if your team is competent you can box them into a corner and make them a 0x pretty quickly. Usually just need to give them some big "special project/feature" and put them on their own repo or branch and let them code themselves into a black hole.
The latter might be fun for chatting during a coffee break, but they consume resources while providing little of value which ultimately means more work for you.