[analyst74]

I worked at companies where managers are little tsars of their turf, and Google.

The difference with Google is that: 1) you can give feedback to your manager, both anonymously and explicitly, and they'll affect their perf; and 2) your success, in terms of impact and promo are part of your managers success; 3) perf committee will challenge and can override your manager if the rating given seems too low/high given the evidence.

These forces while do not take power away from manager completely, they provide some checks and incentivize managers to respect and support their reports.

Of course, all these nice things come at a cost, that is perf becoming a somewhat transparent and heavy process that eats everyone's time and mental energy.