Are you (or they) suggesting that the 4th interview meaningfully reduces the number of bad hires?
I’m guessing not.
It’s poorly designed and/or poorly implemented hiring strategies that lead to bad hires, mostly through a lot of noise being collected during the interview process.
This is a very solvable problem.
Edit: I will add that this is an ad for Booz hiring, so of course they want more process.
6 interviews increase the chances of a bad hire (or at least decreases the chances of a great one). It restricts your hiring pool to those who are willing to be abused by the company. That's not the top-tier talent.
I’m guessing not.
It’s poorly designed and/or poorly implemented hiring strategies that lead to bad hires, mostly through a lot of noise being collected during the interview process.
This is a very solvable problem.
Edit: I will add that this is an ad for Booz hiring, so of course they want more process.