Well if the problem domain and scope is very-very well defined, developing a service as microservice is good / better than monolith. I can't imagine google map API to be developed inside the monolith app instead of running as their own service.
The problem that many developers fall on is sometimes some problem domains feel like they're well separated. However in practice those domains are tightly coupled into each other, that merging them together is better.
The problem that many developers fall on is sometimes some problem domains feel like they're well separated. However in practice those domains are tightly coupled into each other, that merging them together is better.