[suzzer99]

Same concerns here. I've read so much theory on event-based architecture and CQRS, but the examples are rarely applied to user-facing web-app scenarios. Back-end technology should never dictate UX imo.

We're building a user-facing app from scratch - the plan is to start with big coarse grained services, and just use REST for service to service communication when a user is waiting on the line.

But of course favor breaking up the services so there's no communication required is the first preference, and queue-based where it makes sense is the second preference.