Github user cshannon commented on the issue:
https://github.com/apache/activemq-artemis/pull/2012
@michaelandrepearce - because 1) there can be more than just that use case
for having sessionId part of the reference in the future and 2) the acknowledge
code is not part of the consumer and is handled later by the QueueImpl...see
the acknowledge method inside QueueImpl..it just gets the reference and does
the acking and doesn't know the consumer by that point because the
ServerConsumer calls ack on the ref but doesn't pass itself to it...there would
have to be a good amount of refactoring to change this along with changes to
public interfaces
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