

Yes, most likely need to compile it yourself. Or the distros would need a v1,v2,v3,v4 version. Also you need to know the feature set of you cpu. Distros will probably compile with the lowest common denominator, since those are compatible largest range of cpu’s. Cachyos does compile it’s packages for v3 optimization, I don’t think that needs avx512. So can definitely see some distros trying something out.
Yes it is that, on gentoo I had set it like that for a while. Before I specified it to be sure. I Thought linus, didn’t want to have this.