I sometimes need to do work on niche and/or cursed platforms: iPhone, Linux 2.something for MIPS, a semi-functional Linux reimplementation, … Finding a Go toolchain for these is not easy, if it exists at all, but one for C with the right set of libraries (as far as I am aware, just ncurses?) if it didn't already ship with the OS or was available in some prebuilt form is not nearly as hard.