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IMO using approved signals/mechanics for the level one is currently working is one thing.
Signals used for non-verbal communication is another.

The game is about communication now more than ever & if we cant talk during live ball other things can be done to let one know that we heard them.

I dont care for the "get up" too much because thats telling a player what to do, but the "he's vertical, nothing there" the "directional play on point" the "no travel, he bobbled it" & the "it's a block" (clapping hands up & down after the play NOT the tipping signal during the play) are all great non-verbal communication tools! It's the same as when we nod our heads or give a thumbs up signal to coaches/players. Some things need to be addressed immediately or we'll have to sling Ts around... not that we are afraid to do that, but if we can avoid it by giving a gesture to answer a concern during live play why not do so??

I use each of those tools in the games work, yes, including HS games & it works for me. I've been told during & after games that my willingness to listen & respond is much appreciated.