Sure, but again, you could in theory distribute said builds and stop wasting compute compiling yourself. I know nixpkgs, for example, builds with very generic targets and not super aggressive compiler flags, but at least the machinery exists to do this.
On my 10 computers for example? :-) Gentoo wasn't aimed at people with such luxuries.
I'm not a Gentoo user BTW but I do think building from source is attractive for the same reasons cargo (Isn't that build from source mostly?) and go do it.
> Sure, but again, you could in theory distribute said builds and stop wasting compute compiling yourself.
Here are three links that you will find informative. [0][1][2]
While I'm not using the official Gentoo binhost, I've had one running on my LAN for my own personal use for roughly a decade now. It has been possible to set up a binhost for quite a bit longer than that... that's just when I got multiple machines with the same CPU in them, so it made sense for me to set one up.
[0] <https://wiki.gentoo.org/wiki/Binary_package_guide>
[1] <https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Bas...>
[2] <https://wiki.gentoo.org/wiki/Gentoo_Binary_Host_Quickstart>