I hear you! As I said the tools of cloud 1.0 are not that good fit cloud 2.0
That being said, terraform is the best tool I’ve found for managing a large serverless infrastructure. I would agree the Serverless Framework and SAM are not the yet as well.
I would also say that as CTO of a startup in 2015–17 that was building on Lambda/DynamoDB we had similar issues and worked through all these. It’s not insurmountable but we don’t have all the tools yet.