Running nova in a split MQ "super conductor" mode outside of devstack is not required, so I wouldn't consider this a critical regression, it's something that deployers have to opt into based on how they setup their nova deployment.
Running nova in a split MQ "super conductor" mode outside of devstack is not required, so I wouldn't consider this a critical regression, it's something that deployers have to opt into based on how they setup their nova deployment.