Um, remind me since when K'hara can attack without roleplay? I thought the recent ID update clearly states that all Nomads are not exempted from roleplay before engagement.
But, to point the other side's arguments - think that nomspeech needs some time to be written. It gives, alongside with de-cloaking, actually a very huge timegap - up to the minute. Minute is enough for other players to both notice Nomad/K'hara and prepare for the worst.