We train regularly against each other non compliantly. This is the most secure way that I am aware of to grab someone.
Please refrain from making personal attacks. This thread will end up degenerating very quickly.
Chris. I don't doubt your sincerity. I ask you to do one thing though. Next time the person grabs your wrist/back of base of palm as you describe change your purpose. Have as your purpose to remove your hand. I am 100% certain you'll find it easier than if he was holding the wrist beyond the wrist joint.
Your mention of non compliently is a word all too frequently used on these forums in my view for of course he's being complient by holding the way you instruct him to. Even a boxer sparring is being complient by sticking to the agreed rules of boxing.
Anyway my intention is not to make you wrong or to argue so I'll bow out.