> in the future, 100% of the code that you write will be business logic
The present reality of Lambda is quite different though. Even though the code of the function itself is more or less "business logic" (although this is a really meaningless term when we're talking about known programming languages and computers), the scaffolding around it with Terraform/CloudFormation/Serverless/etc. is substantial, riddled with quirks and is really time-consuming to figure out and update. I don't think I spend less time on this accidental complexity now when we have most of our logic in Lambda, compared to the times when we were just running Flask apps in a VM.
This is not to mention how hard one has to fight to overcome the limitations of the runtime, e.g. adding some "warmers" scripts to reduce cold-start latency (no, provisioned concurrency doesn't help and is ridiculously expensive). And then comes the bill after you accidentally created invocation loop between two functions.