The one big reason is, that ARM64 is a reasonably clean 64bit RISC CPU. That doesn't have so much historical baggage to carry as the x86-based CPUs. Which were

The one big reason is, that ARM64 is a reasonably clean 64bit RISC CPU. That doesn't have so much historical baggage to carry as the x86-based CPUs. Which were never loved, at no time in their life cycle. But due to how history went, managed to kill all the nice RISC designs that once were around. SPARC, Alpha, MIPS, just to name some.