The biggest barrier is the lack of face to face meetings. Meeting people in person provides advantages that over the phone meetings can't provide. Smiles are absent even if you are out in public due to the all-important mask we all must wear. Facial expressions are a silent communicator and are absent now as well.  I do find people having more patience with phone conversations as the phone's importance has increased as a life-line to the world. We have added new presentation tools to assist phone conversations which do improve the quality of the phone meeting.