Apple did implement this easier memory model without data sharing because instead of ibm their plan is to get rid of amd64. Why support strange amd64/arm combin

Apple did implement this easier memory model without data sharing because instead of ibm their plan is to get rid of amd64. Why support strange amd64/arm combinations when your plan is to fully migrate to arm. You can do the easier work and use more die space for arm optimizations and effectively showing the developers they‘ll get a speed improvement when porting the code.