Sorry, but I just can't see the problem, you are "broadcasting" a message ,that can be picked up or monitored by ANYONE , if you assume that all radio traffic is monitored/recorded ,it might make you pause,compose,review your message before you transmit.
Voice recorders are here to stay, they are usefull in the intervening period before you have a scribe on board or a station open, and with todays litigious society who would assume any controller role, without having a voicetrail of recordings to backup decisions made on the fireground.
Voice recorders should be standard eqipment in ALL appliances ,for everyones sake!
Cheers Jaff