While stack ranking sounds terrible on paper the actual implementation might soften the blow. Managers probably bend the rules a bit when it comes to the actual distribution in their groups.
For example consider two managers that both report to a VP. Each manager has 10 direct reports. If the managers and VP are all friends then the actual ranking distributions could vary a bit: one manager really has a strong team and the VP knows this. The VP also knows the other manager has a weaker team. As long as the VP's stack ranks are approximately correct in aggregate the individual managers probably have some wiggle room.
The point is politics in large organizations usually trumps strict rules. This can work both for and against someone hence some people don't view stack ranking in such a harsh light.
Forgive me, but holy crap that sounds even worse! Not only does everybody seem to know the system can't work in practice, they actually have to conspire behind the scenes to prevent the worst outcomes? And the assertion that politics trump rules anytime isn't in any way reassuring either. We all know the kinds of people who excel at office politics and they're usually the most destructive, corrupt and unproductive members of the team!
So to summarize what I heard so far: stack ranking is a terrible system based on flawed assumptions, everybody involved knows it, it doesn't actually measure performance but charisma, and for a company to work with this thing they have to sidestep it anyway?
For example consider two managers that both report to a VP. Each manager has 10 direct reports. If the managers and VP are all friends then the actual ranking distributions could vary a bit: one manager really has a strong team and the VP knows this. The VP also knows the other manager has a weaker team. As long as the VP's stack ranks are approximately correct in aggregate the individual managers probably have some wiggle room.
The point is politics in large organizations usually trumps strict rules. This can work both for and against someone hence some people don't view stack ranking in such a harsh light.