Relatable. Me: wants musl libc and to build stuff with clang (so that it's not gnu/gentoo). Firefox: doesn't want neither muls, nor clang due to some god knows how old bug.
Even under FreeBSD and OpenBSD they use GCC for things requiring it, which kinda highlights Gentoo philosophy's problem in this regard. Setting USE flags mostly globally seems like a cool idea, but when for customization it gets down to setting them for every package - one could as well use FreeBSD ports.