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by throwaway_se099 2518 days ago
In those cases, the switched-to architecture could emulate the previous one with acceptable performance. For the hypothetical amd64 -> aarch64 transition, I'm unaware of the existence of software, silicon or the combination of the two which could emulate the former on the latter while staying in a reasonable power envelope.

Emulation is non-optional if one wants to avoid splitting the ecosystem.