My experience of moving to a microservice architecture: the most important consideration with microservices is "who will develop, maintain and operate them?". Y

My experience of moving to a microservice architecture: the most important consideration with microservices is "who will develop, maintain and operate them?". You can split them down functional lines, architectural lines, whatever you like, but if you don't have teams with definite ownership of each microservice (and that aren't swamped by maintaining lots of them like it seems happened with Segment), it will become impossible. The "operational complexity tax" is a real thing but is manageable if your engineer:service ratio is sensible and considered.