Yeah, that suggestion made me roll my eyes. It's the wrong granularity, there's no build system support, it's inconvenient (executable wrappers? require the user to understand all transitive deps?).
It also fails to mention glibc-hwcaps, which would've been a cleaner solution in the context.
Ohhh I had no idea about hwcaps! This is great! That is the way to solve this problem.