I hear you. Miss most of the tools and infrastructure every day since I left. I was ecstatic when they made PubSub available to everyone. Wish they would expose more of the internal services, especially Colossus, Dremel, Borg, ...
Yes, those are using the technologies underneath the hood, but are not them itself. I would like to have access to them directly as I would like to build other things at top of them
not really. BigQuery is for all intents and purposes an instance of Dremel running for cloud users. And GKE is effectively a clone of borg, rather than an instance of it- which is great. It sounds like what you want is a job at Google...