I actually spoke to one of the Touring Professionals about this. They used this on the PBA GEICO Team Shootout this year. Being that this was a "fun" event, both myself and the PBA Member agreed that it was ok for this event. Outside of this type of event, at an actual tournament event, they should not have the earpiece.
The ESPN guys have a chance to interview the players pre/post match, which should allot them plenty of time to get their questions in. These guys are pro's out there, they will remember their mistakes or the adjustments they did/should have made at the end of their match, which is, IMO, the correct time to be discussing it with them.
I was at the Geico Shoot Out and I can attest to the fact that the pro's would be up on the approach, set to get into their stance, and then ESPN (or the PBA, not sure which) would decide to tell them to hold up and have a conversation. This really messes with the flow of the bowlers. If they are going to do this, they should be giving the bowler fair warning to when the questions will come, like before they get up to prep for the next shot.
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