You’re making the unwarranted assumption that they’ll actually emulate anything. The state of tooling is much better than it was back then, and this time there’

You’re making the unwarranted assumption that they’ll actually emulate anything. The state of tooling is much better than it was back then, and this time there’s no 32 bit mode to worry about. According to Anandtech report in 2006, btw, the real world difference was far less than 5x. Indeed, Intel chips had substantially worse FP performance back then, something Apple uses quite a bit in their graphics subsystem.