It's clean, very little warts, they learned from their mistakes with ARMv7/Thumb2 (specifically the IT instruction).
It helps that Apple controls the whole ecosystem and could seamlessly move to ARM64. The Android transition has been making progress also.
Maybe someday we'll drop 32bit and 16bit support in x86 systems (and also in "modern" programming languages!).
You do realize that there exists a world beyond desktop and server CPUs, right? There are plenty of 32-bit embedded microprocessors, and plenty of applications where a 64-bit processor would be overkill.
Huh? Isn't that ARM and not even remotely compatible with x86?
It'd be fun to throw together a modern CISC-V or something that does a better job than x86 from an instruction encoding efficiency perspective, and see how it stacks up against modern RISCs.
It'd probably be about the same since the combination of microcode and macroop fusion makes RISC and CISC essentially the same thing internally. You're basically just trading complexity of the instruction decoder for code density.