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As far as I understand RISC-V has the same lack of standardization that ARM has, no?

If anything, worse - there's much wider variety in the set of CPU extensions available.

RISV-V is messy but for good reason, with real standards, although lots of them, which can be hard to keep track of.

X86 is de-facto standardized by vendor fiat.

ARM is in an unfortunate middle ground.