>or fire/not hire them (if they're the mercenary type who only wants to exploit your salary payments until they can boost their resume at your expense and jump

>or fire/not hire them (if they're the mercenary type who only wants to exploit your salary payments until they can boost their resume at your expense and jump to exploiting someone else for bigger salary payments). Instead, most companies incentivize this very behavior. I wouldn't call them "mediocre developers" when they are playing the hiring meta game correctly, even if it leaves a wake of destruction behind.