The current radio protocol is lacking the variety the arma2 radio protocol had to offer.
I'm talking about the random sentences used in civilian conversations (especially those used by the ALICE2 module (Ambient Civilians - Expansion module), added depth and authenticity to civilians), namesounds for towns/villages/cities/locations, and small phrases like "This is", "Move to" and basically military alphabet words like "Alpha","Mike" etc.

There's also more basic stuff missing like "Requesting permission to join your group!" - "Permission granted", which would really enhance gameplay.