ARM is also a bit of cargo cult. Apple CPUs are efficient and performant, other ARM CPUs not so much. If it's really the ISA or other "secret" Apple sauce, which makes all the difference, is not completely clear.
also somewhere I saw that amd64 is better performance per watt than m2 or m3
It’s absolutely possible to get x86_64 to the same power/performance envelope as apple’s M series chips :)
And already very close to possibly passing ARM. We will see.