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I might not need that personally, but it is the approved mechanic at the HS level. Plus, my partners need to know what I am doing, so it's helpful to give a little signal like that to them as a heads-up.
I spoke to a guy in my area who calls HS and NCAA ball, and he said that NCAA men's officials don't signal until the last possession where the shot clock is on (around 30 seconds). NCAA officials don't tap their chests because they know that OTO calls the last-second shot. He also added that J.D. Collins and coordinators have been cracking down on non-approved mechanics at the NCAA level, so I would not be as likely to work with officials who go off-script there as much as I might at the high school level. He also told me that HS officials who work shot clock games tend to follow the same practices as NCAA men's officials re: last second shots.
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