I'm not sure where you're getting that impression from, law (and many other professions that operate under partnership like structures) often have an up or out system that is significantly more brutal than this. No room for expert operators to stay at a particular level, you get promoted or you leave.

Do you really think teachers or doctors or lawyers (!!!) or journalists don't backstab each other? :-)))

Not as a matter of policy, no.

Neither does this policy require it...