Of course, you don't want a bus factor with executives either although it generally becomes more complicated as you get higher up at a company. You're not going to casually replace a CEO though you're not going to just shut down the company if they get hit with a bus either.
Thus, you could argue that faceless, kafkaesque, "out of anyone's control" systems for talent management are a feature with trade-offs, not a bug.
While I have not worked at Google, simply being a user of its products for the past two decades has taught me that so much of its company culture and values have changed; and rarely for the better.