> Google certainly has the resources to fill the gap

Quite possibly they dont have the resource.

The eng culture today is dominanted by visible impact. Documents are great for everyone, every Googler knows that, but it just cannot be measured.

I wrote some of the most spectacular docs in my previous Google teams. Everyone loves it when they saw them. And no one mentioned them in any formal scenarios. And I am aware of the measurement rules well enough that I didn't bother to waste my time to promote them.

For me, I just care the feelings of the users so much that I personally feels rewarded, but for Google as a whole, there cannot be enough resources for documentation, by the design of the engineering system.