Sure, that's not the same as solving the technical problem of "when to stop listening". But it's solving the user problem of "it doesn't know when to stop listening". And it's not some explicit additional button you have to press to override any default behavior. It's implicit in the new method.
Unless the former UX is still around and this is an additional, optional, pattern. But that seems ... not very Apple-like.
"Manually control when Siri listens by holding down the home button while you speak and releasing it when you're done as an alternative to letting Siri automatically notice when you stop talking"
Given that, it is very Apple-like, in that there is an "advanced" way to use it if you have an edge case, but you can continue doing it the old way if you don't care.
I read it as: hold-to-Siri is just "the way" to use Siri now.
If hold-to-Siri is optional for power-users, advertising it like that doesn't feel Apple-like. Having it seems fine; Apple does that plenty. But advertising a power user option? That's new-to-me.
Sure, that's not the same as solving the technical problem of "when to stop listening". But it's solving the user problem of "it doesn't know when to stop listening". And it's not some explicit additional button you have to press to override any default behavior. It's implicit in the new method.
Unless the former UX is still around and this is an additional, optional, pattern. But that seems ... not very Apple-like.