Please no, nothing is more frustrating and distracting to try to get my virtual assistant to fix something they've misunderstood. That's about as fun as arguing with your passenger about directions while driving.
It feels like a specialized voice control interface with a limited set pre-programmed functionality accessible through specific hard-coded keywords (which is what I assume Teslas could be equipped with for this purpose) might have a much easier time getting things right compared to an open ended general purpose virtual assistant that has to deal with completely arbitrary voice commands and unbounded ambiguity.
I used to think that voice recognition sucked until I tried Google Assistant. Holy shit is it amazing when it picks up every single word you utter every single time. Truly impressive and if car manufacturers can license the voice tech from Google I can definitely see the tech being quite useful.