[anonymouskimmer]

> No one has come up with a satisfactory solution.

Stick your finger inside of a dynamically sizing aperture, or clip a finger reader onto your finger? If both the finger and the reader shake the same there shouldn't be a problem.

That doesn't solve the general touch issue, but it solves this particular case.

[latchkey]

Forcing my dad to carry around and stick something on his finger just to get into his device, seems rather overkill, don't you think?

[anonymouskimmer]

People carry around earpods, keychains, wallets. What's one more little dongle on a keychain?

But sure, I agree (https://news.ycombinator.com/item?id=35790638 ). I'm just trying to come up with some workable solution. Not trying to make the best of all possible worlds.

[latchkey]

Let me guess, you're not a 76 year old man.