I think that wider line is one of the variations that the "super-high-powered-car" guys use because it allows them to make the section between 11-12 straighter and be full-throttle through it. Those guys drive the whole track differently. If you're not having trouble going full-throttle from T11 to T12, there's no reason to not be taking the tighter line.

Most "normal street cars" should benefit from more of a "momentum line", the shortest distance that allows you to maintain a smooth line.

I still get a kick out of the guys who reference things like "the right tree" and "the tower". I'm a heads-up driver, I look at the other cars on track, and I spot every corner worker station as I approach it... but I'm not taking time to look at the scenery in the middle of a tight sequence of turns!