The whole "excessive positivity" thing does seem, well, a bit American to be honest. I'm in the UK. A couple of years ago, I started working for an American multinational, and about half of my team is American and based in the US.
Whenever there is a all-hands meeting, or even in 1:1 meetings with my direct management, there is always a "Oh, that's a great question!" response before they actually start answering, and then they'll usually end the answer with a "Thankyou for a great question" at the end of the response. I found that very jarring to begin with. I'm not saying that we're any more straight forward with our responses, but we tend to be a lot more succinct and to the point and we don't dress up statements with the excessive praise like that. Usually, when someone says "Good question" over here, the implication is "I don't know, I need a second or two to think about it" or "I'm thinking out loud with this response".
Anyway, I suppose the point I'm trying to make is that if it's American people primarily training this thing, it's going to learn primarily American responses and behaviour.
