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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
Do you have to mash it? Or will pressing it normally work?
The only thing I'll mash is that subscribe button
NO
Pretty sure Apple would replace the buttons with pressure sensors – not for user comfort but so that they are no longer replaceable with OEM parts and can be serialized. They did literally this with Macbook sleep sensors.