The thing you are forgetting about your operator is that they have a history of being totally inflexible when it comes to manual/policy interpretation. There is no good reason for them to have banned personal headsets, they are just taking their interpretation of the Airbus Authorised headsets to the ultimate interpretation despite people successfully using heir own headsets for years. Having said that I always have found it a pain in the arse when flying with people who have the uFly mike as it seems to get bad interference when flying near heavy rain and it does something weird to my ‘sidetone’.