Yes, we do it as well - we have local monolith workspace package that combines all services and simulators in single node process. We don't use it on any enviro

Yes, we do it as well - we have local monolith workspace package that combines all services and simulators in single node process. We don't use it on any environments, just for local development and ci. It works very well (very fast, very little resources and with simulators for external services you can work even on a plane without internet if you want and system behaves very much like real one in production). And yes, non-microservices doesn't imply monolith. We have many services. But they're not microservices because they don't have their own data store and distinct versioning/deployment - they're part of monorepo.