I bet GCS docs will not keep up with changes to GCS very well either, judging by other Google docs. Start out good, don't keep up with changes. AWS docs are relatively good at keeping up with changes.
Google's docs are the most inconsistent. The newer the service the better the documentation in my experience. The App Engine docs are like a rats nest, but the Firestore docs are really well done.
My guess is they now care a lot more about Google Cloud than previous product endeavors. I’d also guess that people at Google would put in a ton of effort on documentation to avoid having to speak to people on the phone.