He was too distracted with all the other things going on under his watch. He spent too much time trying to convince rank and file that it's OK to do business with customers they don't like, trying to ensure arbitrary hiring goals were made, and appeasing the internal activists that led protests and pressured to exit people that didn't fall in line.

This is why the CEO of Coinbase sent the memo a few years back stating that these types of people (not mission focused, self absorbed, and distracting) should leave the company. The CEO of Google should be fired.