Retro, as in retrograde, going backwards.
I've an iPhone 6 with the wonderful touch ID which is really reliable and incredibly convenient. The phone seems to work well enough and as a little computer/smart phone is fine.
I fail to see any reason for spending any money on an "upgrade" to any of the current phones whilst my existing one works. There's so little benefit in the new phone compared with the iPhone6. Sure, the new one's lightly waterproof which would be nice to have, although in ten years of owning iPhones -- since the iPhone 1 -- I've yet to drop one in the bog (phone that is).
Aside from waterproof, there's sod all else which is worth spending how fecking much you piss-taking greedy bastards...!!! Honestly it comes to something when they're quoting "better graphics performance" as a benefit when there's sod all wrong with the old one (that's a feature not a benefit BTW).
Anyway, the only reason they need facial recognition is because some bellend removed the wonderfully slick fingerprint reader.