I think an ACRE-style voice communication system would be a great feature in vanilla Arma 3. Being able to have the functionality of ACRE without having to use third party programs or fiddle with mods sounds like a dream. If the current VoIP isn't meant for realistic communication then I think it would be a good idea to include not only the ACRE features but the vanilla chat as well. That way if normal, or vanilla, communication is desired then it can be used, but people or groups who want to use a more accurate, realistic radio system would have the ACRE functions they could work with.