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> ARM/RISC-V would be interesting once that hardware is standardized.

Could you elaborate on this? Both ARM and RISC-V have standardized their hardware feature and different target versions.

Is it more on the iterative angle given X86-64 now moves very slowly?

While the ISAs are (mostly) standardized, the broader hardware support is a mishmash.

ACPI is available, but not widely supported.

Some hardware uses DeviceTree.

Other hardware just expects you to know what devices are connected and how to interact with them.

What about SBSA, it's not universal but at least it's a target.