I had the same gripe when I worked with GCP. Their stuff is exotic, and had weird behaviors in corners, but the docs didn't give you enough context to steer away from them.
However, over the last 5 years or so, AWS docs have gotten worse.
So I guess now that they are both bad I can't complain?
Did they? Do you have an example at hand? We ran into "weird" issues a lot of times with AWS services just to discover afterwards that almost all of them were covered by their documentation.
It was totally our fault and these were also no "hidden" docs.
However, over the last 5 years or so, AWS docs have gotten worse.
So I guess now that they are both bad I can't complain?