Craig Federighi repeated a statement that's often come from Apple executives - we don't want to know your personal information. New Siri and Search features are entirely anonymous, not associated with an Apple ID, use a randomized identifier, are not linked to other Apple services, and are not shared with third parties.
I'd rather that Apple DID keep my voice recognition data associated with me, like Google does, instead of only being associated with each device individually.
Or at least offer the option. It should be my choice. I appreciate the power of a voice recognition system that knows my voice and search patterns just as well from ANY device I use, old or new.
Buying a new iOS device means Siri has to relearn me all over again, since Apple says we're only associated by a random number with that device. OTOH, Google voice recognition always works outstandingly for me, even with a fresh out of the box new device that I've just logged into, because it's had years of recognition experience stored under my id.
(Anyone can of course wipe out that stored info and/or turn it off using their Google Dashboard. But why? I did that once years ago and the system had to relearn me, so now I leave it on.)