I would say that a deaf person should be paying even more attention to the road rather than reading a text message displayed on the screen. I had a short, brief stint of using Android Auto in a Chevy Impala and having to press buttons is never a good sign to read text messages. And for someone that constantly is bashing on Tesla these days, maybe the pot shouldn't be calling the kettle black.
If you go back, you will see that you proposed using "Hey, Siri" in lieu of displaying texts on the screen. I stated that is not an adequate solution for deaf people, who would get much more out of having the text displayed on screen. Your comment of "a deaf person should be paying even more attention to the road rather than reading a text message", aside from being offensive to deaf people, is an attempt to shift away from your original position after being shown an example where your idea doesn't work.
EVERYONE should be paying attention to the road, period. Has nothing to do with whether or not you are deaf. You don't sound like someone who knows any deaf people, if you did you would understand how what you said above would be interpreted as being offensive. I'm married to a deaf person and am very dialed-in to deaf culture. They do not see themselves as disabled or handicapped, and the lack of hearing has spawned an entire subculture that is proud of being deaf, resists correcting deafness or treating it as a malady, etc. Deaf people do not view themselves as less capable than hearing people, just as people who speak a different language. Walk a mile in their shoes.
Displaying text messages in a large font is likely a much safer solution than forcing someone to pick up their phone, lift it to their face and read the small type. It's certainly much less dangerous than fighting with Siri through a deaf accent.
"And for someone that constantly is bashing on Tesla these days, maybe the pot shouldn't be calling the kettle black." What does this mean, exactly? I'm critical of Tesla, yes. They are acting stupidly in many ways and ignoring the needs of customers. At least I'm not a lemming.
I don't think the sound system in my Tesla works for deaf people either, and yet we still have it any many find it quite useful. The deaf don't seem upset about it.
The radio is not a proposed safety feature that is being discussed here, as such it is a poor comparison.