Any convention is for a group of players to decide to include or not.
Why it should:
- more plays = more fun
Why it shouldn't:
- simplicity:
-- follows the principle saying plays should stop as soon as bluff is revealed
-- there are situations when such an unnecessary clue is the only feasible clue following good touch principle
-- there are situations when touching only chop will be known trash the the clue receiver, but not someone else, for example 3r & 5m played, red clue touching chop followed by discard tells someone else is holding 5r, but not revealing where exactly
-- if any of the above is valuable enough and thus would result in only a single play, that creates exception to exception, reverting to how a trash bluff clue is responded to most of the time, creating opportunities for even more human error
- there is no need for bga conv to attempt to be more efficient, human error and BDRs are the most common causes of game loss