Not having the auto-selection of arch/opts/flags is "the point". The ability to customize multiple facets of the OS is Gentoo's strength, and should be leveraged as such. I thank those individuals running ~x86, and those that test all of the combinations and permutations of cflags and library versions. It is their efforts that ultimately make pre-baked distributions more reliable. Gentoo users suffer so the rest of us don't have to. In regards to benchmarking, any Gentoo result is only representative of the user's Gentoo installation, not all Gentoo installations. I'd be willing to concede a bit if the benchmark author was the one constructing a targeted Gentoo installation for his/her benchmark. Alternatively, if
Gentoo-BSD were to a point where meaningful comparison data could be obtained, I'd probably be interested in the comparison.