Deploying a messaging server is a relatively small part of a corporate communications system. Production introduces identity, client applications, voice and video scenarios, storage, backups, monitoring and controlled upgrades.
Migration is another layer. Moving users, rooms, message history and attachments requires a frozen source state, controlled batches and validation before the entire organisation changes over.
The value of private communications infrastructure comes from operational and data control, not simply from installing software. The organisation knows where information lives, how the service is restored, who governs access and how the platform can evolve.