My 2007 Infiniti G35S and 2010 M35X both comes with voice control from factory and I never use them...
My another newer car which is 2017 Lexus GSF also comes with voice control and I don't like it, either.
Why? Because current computers are still very dumb, I have to give exact commands. Otherwise the computers won't recognize my commands.
That's why AI is so demanded right now. However AI is no easy.(100 times more difficult than current programs) But once AI is implemented and practical. 99% programmers will also lose their jobs I think...
I do agree with you that the built-in AI isn't very responsive as Apple Siri or google Assistant or so on. However, newer cars that come with the Apple CarPlay or Android Auto support can use the voice assistant from your mobile phone, which is much more useful. (Like my VW Golf, I can reply easy text through voice control).