That’s a difference between NServiceBus 5 and 6 and is completely normal. NServiceBus 5 only had the concept of the subscriber address, and for MSMQ, if that subscriber was scaled out, it assumed that address was a distributor address. In NServiceBus 6 we have sender-side distribution instead of the distributor, so if
MyEndpoint@MachineB both subscribe independently (without a distributor managing it) it’s necessary to know the endpoint name is
MyEndpoint so that sender-side distribution sends the event to only one endpoint instance and not both.