Being able to hold a pen in your hand and write a note that looks legible is a fundamental skill. One should be able to write a message on a card that does not make the recipient want to puke or at least wonder if whether the author survived what looks like an obvious stroke. It’s a matter of self respect.
He is not deflective. Your comments are rather dense. The orthodoxy of ‘changing frame’ and ‘putting it in a language they understand’ is layman drivel. It is not always possible to do so and it is overwhelmingly untractable if you eskew the fundamental reasons in a discussion with a non-expert that insists on technical justification and just doesn’t take your cookie-cutter time/money/competitive advantage talking points and can’t provide you with specifics that can be quantified.