I think that wearing earbuds while playing can be very beneficial to some people that have an issue keeping their temper on the course. It can be very calming and relieve stress. On the other hand, if I were to play in a tournament and my playing partner(s) is/are wearing earbuds, I think it would be very awkward. Because of this, I think disc golf should be a sport where earbuds can be used for a casual round, but during a tournament they should be left at home, and you should learn to be able to play without them.