> Surely you can come up with some better today were you to design it from scratch? Ya, but then you have to develop and support the entire ecosystem around ju

> Surely you can come up with some better today were you to design it from scratch? Ya, but then you have to develop and support the entire ecosystem around just the instruction set. That means compilers, languages, runtimes, and more - which is not a trivial undertaking. Perhaps Apple could pull it off, but it would take a very long time to get something entirely new stable enough, and performant enough, to compete with anything being offered today. Plus, it's not Apple's focus and doesn't really benefit them much either. Nobody builds iOS apps in assembler - but they expect it to run fast. That takes a very well tuned compiler, and a very well refined CPU architecture.