The binutils sframe maintainer has changed their email address.
https://sourceware.org/pipermail/binutils/2026-March/

Meanwhile, I heard that the person who pushed for llvm sframe has left Google.

While I am suspicious of SFrame' long-term maintenance, IBM is doubling down on SFrame by adding a PowerPC port alongside s390x -- a strange move.

I strongly recommend that anyone proposing a new unwind format for the Linux kernel take the time to rethink and refine the design.
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On SFrame v3:

Cherry-picking a large number of patches right before the binutils 2.46 release effectively introduces insufficiently validated changes during the stabilization period of the release branch. More critically, rushing v3 in may have foreclosed improvements that community feedback could have delivered before the format was finalized.