yeah definitely agree.

Generally, the microservices that I've seen work well are the type of things that you could decide to "buy" in the build vs buy debate - like you say, stuff that are either "fire and forget" or stuff where you only care about a fixed output produced, not the guts of how it's done.

Anything that depends on your core business logic within the service (if customer type X, do custom process Y) is probably not going to be a clean fit for microservices as you'd think, especially with an emergent design.