I think the most powerful argument for Apple reintroducing Touch ID in the future, is that Samsung just launched the Galaxy S10 line with in-screen fingerprint scanning.
You could use the same argument for the 3.5mm jack.
We also saw Huawei launch their under-display fingerprint sensor on their flagship last October, so the tech isn't new. Apple follows their own roadmap for biometrics.
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How do you know it's not coming back? Are you a reliable Apple source now?
Credible sources like Kuo have repeatedly said no.