I think that the ARMv7 -> ARMv8/Aarch64 move is interesting in this context. Arm has swapped a large part of its application user base from 32 bit to a complet

I think that the ARMv7 -> ARMv8/Aarch64 move is interesting in this context. Arm has swapped a large part of its application user base from 32 bit to a completely incompatible but more modern 64 bit ISA and Apple has cast off the 32bit legacy completely due to its ability to control the whole stack.