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Good points. Worth noting that PPC -> x86 was a 64 bit to 32 bit transition.

I assume we will soon see ARMv8 -> ARMv9, but that will hardly be noticeable.

I owned the first MacBook Pro but it died before the architecture became an issue :(

Overall Apple should be good at architecture transitions by now as they've done enough of them!

They also never fully went 64-bit on PPC, so there was never really a transition there, just some 64-bit machines that could do some slightly different things and I don't think there was ever a full 64-bit version of OS X for PPC. So there weren't any huge painful breaks.

Also the jump from 68000 and 68010 to 68020-030-040 had a similar transition (if anyone remembers having to worry about wether your software/system was 32 bit clean)