If 6-30% are failing year after year after year, you can't blame the interview process. You could blame the leadership failure that didn't fix the interview process, though.
Of all the FAANG, I almost admire Amazon for chewing up & disposing of their white collar work force the same way they do their blue collar.
The other guys are all pretty bad to work for at the bottom non-SWE tiers, but have cushy SWE adult daycare office environments. At least Amazon treats all their employees as disposable?
I love that description