The "overpaid" bucket is a risk at Amazon that some don't think about. Some manage to hack the performance process and then get tossed out because they're then ranked against senior people and how long you've been senior doesn't factor in.
But as far as not doing too poorly, how sure will you be that you're not in or close to that 10%? For a lot of people who aren't completely assured of themselves, this is a constant source of anxiety. Couple that with the leverage your manager has to casually place you in that bucket twice a year if you haven't done enough groveling, and this is where a lot of the toxicity at Amazon corporate comes from. People don't want to help each other because they have to look out for themselves.
Over time I saw three kinds of people thrive in that environment:
1) highly competent, productive people who managed the culture and workload with ease.
2) people who have Amazon as part of their identity and will sacrifice their well-being or personal life to meet the bar
3) typical corporate sociopaths that are non value-add
In my opinion they are growing bucket (3) the fastest.