Jmo, but I think that the purpose and intent of having the whistle at the end of a TO is to alert the teams that play is about to begin again. The idea is to get them out of their huddles if they're tarrying a bit, or to get them into position if they're just taking their time a-bopping on over to you. If you've already got 'em lined up for a FT coming out of the TO, I really can't see any purpose to having an additional whistle sound.
Iow, no really big deal either way imo.
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