Except you can pick who to fire and the people leaving because they have better options might be slightly more valuable. Then again trusting or upper or middle management to get that right (outside of small/medium companies) is impossible.

Amazon doesn’t need the best. They need the desperate, the good enough with no better options. Those you can abuse and squeeze.

That's a local problem in that it affects the teams themselves, for the guy running the global Amazon spreadsheet it doesn't matter.