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There can be no such thing as an ARM compatible instruction set that is not an ARM instruction set. Either it supports the necessary instructions then it is an ARM instruction (possibly super)set or it doesn't then it's incompatible.

I would say no if only because it's easier to find talent that understands ARM than it is to teach talent about the nuances of your own single-platform instruction set.

I think that argument would apply in a lot of places but most likely it wouldn't apply in Apple that are famous for their "not invented here" attitude across the company.

Apple was one of the founders of ARM.