This seems really excessive. You'd have to have really good tooling to build, deploy, and debug (since log streams are oriented per-function, not per-request),

This seems really excessive. You'd have to have really good tooling to build, deploy, and debug (since log streams are oriented per-function, not per-request), and I'm not sure how that could be performant, especially if you're making O(N) (or worse) network calls per request. My understanding is that microservices are typically 1-5 per team.