As I understand it, they didn't 'go with D over Go' so to speak. They employ a fanatic of the language who wrote a piece in D, presumably with approval, and us

As I understand it, they didn't 'go with D over Go' so to speak. They employ a fanatic of the language who wrote a piece in D, presumably with approval, and used it. There's nothing wrong with any of that, and I hope it works well for them. But I wouldn't say it was exactly chosen in advance for its merits, other than having an awesome programmer in the language, which can be one of the biggest reasons at times.