[ovirt-users] Questions about old plan for engine-vdsm communication

hello, I have some questions about the old plan ( https://www.ovirt.org/develop/release-management/features/infra/jsonrpc.html ) 1. any reason ovirt stays on phase 2 for years? (please reason for the cancellation if canceled) 2. In the final plan (phase 5), what was the purpose of separating the VDSM subsystems? Is it for performance or any other reason?? 3. any special reason like openstack integration the AMQP was adopted as the main messaging protocol in the plan? Thanks,