Most of your points are not relevant to my original statement of the code being generic - they are talking more about the architectural decisions. If I want to use DynamoDB I can do so in EC2 or Lambda, serverless doesn't dictate that. You also seem to believe one chooses Lambda because of complexity reduction and that's not really the only reason. I can very easily port a node/express API backend that connect to RDS to any other cloud provider. What about serverless makes you think that's not the case?