I found most precompiled C++ libraries target a specific minimum microarchitecture because it swells the binary size if you do fat binaries, and for most users

I found most precompiled C++ libraries target a specific minimum microarchitecture because it swells the binary size if you do fat binaries, and for most users they wouldn’t know anyway. Companies always get complaints when they bump up the minimum though - I remember reading some articles about some games requiring SSE4.1 or AVX and gamers complaining they couldn’t play it on their ten year old machine.