> I'm not saying serverless is bad for everything

Title is clickbait

While I agree with basically all of the points presented, I really dislike the code example.

> This code is AWS-specific from top to bottom:

Well, that's because it is the integration layer, written by hand in Python. Of course it will be different for each provider. If you want something more abstract, try a framework that does it for you, like Spring Cloud Function.