Interesting to learn that Siri or Google Assistant can be activated with a long press.
It might be worth noting that Google phones home to get its supercomputers to do the actual speech recognition, so you will need a data connection. Presumably the native speech recognition software is built in to the Golf media centre and since this requires quite a bit of processing power (less these days with more sophisticated algorithms but still quite a demand) it might be slow and inaccurate. Good microphones are important but I think there is only one built into the Golf (?) so it can't triangulate and eliminate noise.
Ideally, like the new speaker pods sold by Google, Amazon, Apple, robust speech recognition in a noisy environment needs to be built-in from the ground up with multiple microphones and good pre-processing.
It would be a good security feature if this were built in to a car since the vocal tract is unique, like a fingerprint.