Just as a note, from what I see the problem is not only the privacy implications but also that the local AI comes with a baggage amounting to 10% of the space on the base mac models. Which is already severely limited.

I have not found the local/remote hand off to be very reliable either, so tasks that used to be almost instantaneous for Siri are now spinning to the point where I assume they failed. A simple 2 minute timer took almost 30 seconds to set the other day.