@peoples I am all in favor of the “optional” inclusion of contact information, especially in the context of providing traders with another avenue of solving a minor glitch without involving an arbitrator.
In the case of my arbitration, the other party failed to provide the needed email address for a Canadian Interac e-Transfer, which stalled the trade for a few days and consumed a fair amount of my time between messages with the arbitrator within Bisq and posts here in the forum. If I had been able to send some form of communication to the other party, we might have concluded business much faster without burdening arbitrators with such trivial matters.
Another approach could be a secure messaging system within Bisq (that traders can choose to opt in or not). If the problem cannot be resolved between traders via these avenues, only then would we involve arbitrators. My 2 cents.