To me what is fair is an approach that doesnt take the line "DLM is always right".
The system should stop serial abusers e.g. someone ringing every week to get DLM reset as their line is erroring like crazy causing interleaving, but should also let someone who has rang up who has never made a request before get it actioned without any serious questioning, just do it.
I would also like to see one of 2 operation modes for DLM.
Latency preference on or off.
If on, banding would always be preferred over interleaving for stability action. If off, keep the current behaviour. It could be labelled as a "gamers" flag to keep things simple.