[amano-kenji]

Most advanced users don't really care much about latest compiler optimizations.

I don't. I think linus torvalds still just runs GNOME or KDE on fedora. Linus doesn't care about compiler optimizations on his own machines.

Does a web developer need to know latest compiler optimizations? Most of them don't.

[d3Xt3r]

Respectfully disagree, the kind of "advanced" users who typically use Gentoo actually do care about compiler optimisations.

If you use Gentoo and don't care about it, I'd say you're in the minority of those users.