> Then anyone can code implementations to that interface for whatever cloud they like in separate repos, similar to the way `database/sql` is structured

Of course they can, but you're working on a Google-centric version first right? Otherwise why would it be at Google Cloud Next?

That makes all other cloud providers second tier, and I don't think you should call yourselves "platform neutral". If you were, you would code up multiple platforms from the beginning, like is normally done for support on different operating systems for example