Crew and Referee Mechanics - Penalty Enforcement

[whitehat]

Just wondering at what point signals for R will no longer be necessary. That is, especially in NFL and College where all R's are "miked" up.
In HS I can certainly see retaining signals as only a few games in larger venues do I have a microphone on me.

I can see signals practical between officials to let each other know what they have...

Just seems a bit useless and redundant for R to tell everyone over the PA system what he has while flailing his arms around...