Yeah good point about Forza being born as a response to GT. I wouldn't go as far to say the racing isn't important to Forza at all, and its certainly going to to be a mile better than the racing that took place in Forza 5, but you are right about the lack of penalties, pits etc and the general overall focus to sim racing. I think T10 still continually reiterating the numbers game in interviews shows that they are still more about hitting that car collecting niche more than the hardcore racing niche like PCars has done.
Let's ignore Leagues and how they went in more detail with them at Gamescom and talked about them on stage.