No need for bootstrapping step, 90% of portability taken care off for free, ability to use lower level and faster primitives than Go offers, access to tons of great C libraries.
You sir, have clearly never attempted to write portable C or Go code. Writing portable C code takes a serious effort. It's not hard if you know what you have to pay attention to - but 90% portability taken care of for free? That's simply not true, unless you think being portable is "it runs on a POSIX system".
Writing portable Go code - in most cases - you don't need to do anything or make only slight changes to your code, and cross-compiling is the easiest I've ever encountered.
