DEMinSoCAL
macrumors 603
My take on this:
1. The people complaining of removal of touch ID and that it "just worked" obviously never had sweaty or wet hands. Also have perfect fingerprints. I can tell you if any bit of moisture on my fingers has been an issue. My son cannot even setup and use touch ID as his fingerprints are not deep enough or something.
Since you're addressing me, my response is that while not perfect for 100% of users (what technology is?), it is mature and tried-and-true technology. Sure wet fingers, or over-dry fingers have a problem, but that is why you register multiple fingers, or lick them, wipe dry and try again. Really, I am completely happy with TouchID (except for the fact is sometimes is TOO fast at recognizing my finger when I don't want to log in but just turn on the screen).
I cannot comment on your Son's condition except for the fact that he's in the extreme minority (I guess double-amputees might have a problem too if that helps your claim that TouchID doesn't "just work").