do you think it's a better user experience to have to say out loud "windshield wipers faster" / "windshield wipers slower" every 30 seconds compared to subtly clicking the control on the stem? How well will it work with music on and while you're having a random conversation with your passengers? How well will it discriminate random voices on the radio telling your car things like "driver seat recline angle flat" or "driver seat position full back"?
Voice control is a good things for services but not for driving related controls, it's a QOL increase to be able to tell your car "set the a/c to 67 degrees", but let's leave the driving related functions (lights, wipers, cruise, ...) to hardware buttons/dials on the stem where they belong.