Re: Hmmm...
“Apple wasn't scheduled to use Intel 10nm modems until fall of 2020 (the 8160) so it wasn't going to be a problem for Apple unless Intel still couldn't make 10nm work by summer next year.”
That’s my assumption...10nm will never produce volume parts (IMHO). I suspect we will know by the end of this year when Intel announces an EUV process.
The killer problem is a combination of a slow etching process (# of steps) combined with other process issues resulting in low yields. Intel don’t have a way of producing high volume parts.
Speculation, but there are reasons behind it.