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I'm joining the debate a little late here, but I used to agree with tomegun. No need for whistles on subs most of the time.
Then I moved and came to an area where those working the table generally aren't as consistent and qualified as where I was. Now I whistle for subs. It prevents a lot of problems. I haven't found that it devalues my whistle. It does prevent my over-anxious partners from getting the ball in play before subbing is complete.
I happen to believe this is a lot of "hand-wringing" and not because I'm out of arguements. Just do what's appropriate for your area. Whistling is definitely appropriate here.
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