Personally I see no problem using text where there is no audio available, it was done in LCPDFR! If at a traffic stop you asked for a licence but he didn't have it, there was no audio for that, something like "Sorry officer, I forgot it at home!" Would appear over his head, and when on the street and asking for ID, similar might happen. Or on a drunk call, pedestrians might insult the drunk by use of those words over their head. And there's no reason not to use text for the radio ID call-ins, it was done in LCPDFR too, the radio when calling backup would be audio and text while ID only used text