>>Google feels like a company that's run by a bunch of engineers/product managers instead of a product leader with a cohesive vision.

Google is a company that follows a model called OKR. Here, in this model, the company is always supposed to be chasing moonshots.

There fore all incentives, pay, raise, promotions, stock grants etc etc are all attached to such moonshots.

There is zero incentive for anyone for to maintain anything.

The system is working perfectly as designed.