Schiller admits that 'evil twins' is a weak point.

If evil twins are a weak point how came facemasks don't work?

Evil twins have faces made out of skin, not rubber.

I would imagine the facemasks where not accurate enough when it comes to the the 3d structure.

Could be a different thing when somebody uses a quality 3d printer to print image that is based on detailed laser scan.

Not very practical when hacking a random person's iPhone. And this would never protect against a state-level actor anyway.

facemasks are static whereas features/muscles on a face move a bit?

or plastic surgery for that matter?

Oh come on.

I say if you're willing to undergo major reconstructive surgery just to read my emails, go ahead, you've earned it.

This is, of course, a threat model issue. If you're Assange/Snowden, you might want to shy away from Face ID, but you probably didn't have Touch ID on anyway.

It's called Apple Twin Share

Do identical twins actually have identical faces? Some of their facial structure must be shaped by diet, exercise, life in general, right?

Recently saw a video made by identical twins whom I knew back in the '60s, and their faces differed much more than they did at that time.

Don't know about Face ID. Microsoft Windows Hello solved it couple of yrs ago.