It is much more dangerous to have someone hold your weapon hand than it is for them to try and headlock you, or punch you in the belly.
So should we train primarily for grabs of our right wrists? In randori, should uke concentrate on grabbing nage's right wrist (unless uke knows nage to be left-handed, not an issue for samurai)?
I'm not trying to be a jerk (I can do that without trying). I'm trying to find some consistency in the many opinions I've read about wrist grabs, and aikido in general.