But you could, you know, actually measure performance and manage according to it.
I'm not saying self-selection shouldn't be a part of it. Some employees should absolutely be thinking, "eh, I might be managed-out eventually for underperformance because I am not a great fit here... and I don't know that I can fix it or that it's worth fixing it" and depart on their own.
But it should absolutely be because management quality is good and everyone understands the process and what's going on. Not because the workplace has been made artificially unpleasant to see who quits: that makes the wrong people leave.
I can see them getting fired for not hitting their hiring and spending targets when the company has aggressive expansion goals.
And the idea you can hire thousands of people and exclude all potential deadwood is just fantasy.