[throwaway2016a]

I agree with a lot of what you said. Though you may want to look into AWS EFS a sit has opened up a whole bunch of use cases that were previously very difficult with AWS. You can also use Lambda with VPC Endpoints to make the network distance to DynamoDB more efficient.

But yeah, if latency between servers is a concern of your's than Lambda is not the best. But for a different reason than you described, I think it is the lack of ability to have a long running network connection that is the hurdle there since handshakes take time.

Didn't mean to imply it is a free lunch either. But I do think it should be most people's default. The goal should not be to be free it should be to provide high availability and reasonable performance for minimal cost. And in my experience Serverless does that very well.