I have voice activation in my car, tried using it once didn't work. I have an iphone so using "Hey Siri" is much easier and very accurate, even when the phone is in the door pocket. From memory the voice control button uses Siri or the android version when connected via carplay
When you come up with voice activation worse than Siri, you know you've gone wrong.
Seriously though, car makers should just give up, and let the companies that actually
do that stuff lead, like Polestar and Google (or Apple Carplay/ Android Auto, which VW are obviously already doing)