If he can jump platform willy nilly, that means he is not using any of the Apple services. He could’ve jumped into Windows Phone and it won’t matter. He probably values just the hardware, not the ecosystem.
Of course, it’s not like Apple stops selling iPhones with Touch ID. iPhone 7 and 8 are still for sale. So I smell more like a Pixel troll.

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Well isn’t that obvious? If you know the PIN, then it’s safe to say the iPhone assume you are the legit owner. If you tell people your PIN, even Touch ID won’t matter.