Not sure why you think most Google Cloud Services are in beta.
The Google Cloud products page [1] lists 17 main products. Two are in alpha (Container Engine, Deployment Manager), one is in beta (Pub/Sub).
The rest are fully supported. There are some beta features here and there...but saying "most" are in beta is certainly not correct.
What's the issue, here?
Wait a second. I just clicked though the items on that page, and the following are listed as alpha:
Container Engine
Cloud Dataflow
Cloud Deployment Manager
The following are in Beta: HTTP/HTTPS Load Balancing
Virtual Private Network
Cloud Pub/Sub
Cloud Monitoring
Cloud Logging
If these aren't in beta/alpha, then maybe you should update your docs.In some cases, there are GA products with alpha/beta features & languages, so it may be difficult to figure out the best way to communicate at the top level (e.g., the examples pointed out for a given feature in a given language, or HTTP load balancing vs Network Load balancing).
But in cases where it's clearly a beta product, it should be clear.
Autoscaler and Instance Groups on compute engine are beta as well.