So there is no Yakuza game that has Go in it? Really?

I've only played 0. But I was curious if they ever have the Chinese board game, Go. And from what I have researched, it doesn't seem like the series ever adds it. Its really weird. Go is something I would have thought would in the series from the very beginning and in every single entry. Why does Sega not like Go?

Go may be hard enough to program that they've never wanted to spend time on the AI for it.