It appears the decision was made to hardwire AVX support to "on" recently as all the hardware for Big Sur supposedly supported AVX, not noticing that Rosetta 2 violated this, and then the bug report(s) started coming in about precompiled binaries being broken under Rosetta 2 since that change.
So I personally find it interesting because I would not have expected Rosetta 2 to be missing AVX instructions if all the supported Big Sur hardware possessed them, and this is an interesting failure mode to watch and see how the Brew developers handle.
So I personally find it interesting because I would not have expected Rosetta 2 to be missing AVX instructions if all the supported Big Sur hardware possessed them, and this is an interesting failure mode to watch and see how the Brew developers handle.