> For lots of the fundamental Go words, they'd need a new English word coined anyway or an imperfect metaphor.

This. Even the chess words that are anglicised have special meanings in chess. Being a native speaker of English doesn't help you understand what a "Bishop" is or what is "Checkmate" (OK, that's an anglicised Persian word) or the difference between a "Pin" and a "Skewer".

Also, most of the Japanese terms don't have a meaning outside Go, so it's not like Japanese people get a leg up there.