Not who you asked, but: it wouldn't change mine. My phone is one of the most private things I own, it stores private thoughts, communications and pictures. If someone goes out of their way to try and sniff data in there, that's a no go. I might even go to the extreme of saying that I'm willing to even give child pornography consumers some uncomfortable freedoms, if it guarantees that my freedoms remain untouched.

(and all of that would be before I even consider false positive rates)

If this was the case I'd think Apple would have mentioned it by now to appease the situation.

But even if that was the case, the tool will now exists for any dictatorial government to spy on "troublemakers". The Chinese government, which has already gotten full compliance from Apple, would be foolish not to use it.