Indeed. Both falkor and thunderX2 are A64-only. The backwards compatible A32 mode is optional only and not implemented by the ARM server vendors except Ampere eMag.
Yes, and I wouldn't be surprised some year down the road, or even next iPhone A13 would be AArch64 only.
iOS 11 removed support for 32bit applications. Because the iPhone X requires iOS 11 I’m not aware of any way to run 32bit code on A11 processors and above. A32 support is likely already gone at the hardware level.
Thanks. Anyone know whether the recently announced ARM 'Ares' core supports anything but A64?