The discussion of Microservices vs. Monolith feels a lot like NoSQL vs. Relational one. That is to say, Microservices are a bad idea right up to the point where monoliths won't work.

Most services can be successfully implemented with monoliths (and relational DBs for that matter). Only when that solution doesn't scale anymore, that's when microservices come in handy. Particularly when a large service has core functionality that must always run and secondary functionality that can tolerate higher rates of failure.