Indeed. I have seen several teams with a bunch of (self-styled) "10x" devs, and found that the productivity and quality of the team decreases in direct proportion to the amount of "10x" devs on the team.

I shun "rockstar" and "10x" (and whatever other bullshit moniker they will come up with next) team members. Give me a group of smart people that gel well together, and are highly self-confident without egos getting into the way, and we can move mountains.