You also lose benefits of microservices if they have to stop and change the data exporting system all the time too, slowing down development. The main benefit

You also lose benefits of microservices if they have to stop and change the data exporting system all the time too, slowing down development. The main benefit of a dumb copy is that the production service is not impacted by reporting, only a copy is. This relates to performance (large queries) but also implementation time.