It's easy to say, because I've said it, and I say it every time a Forza is released and the same handful of people whine. It really doesn't matter to the majority (and it's a vast majority as well) of players, casual and enthusiasts alike, when there are many far, far more important things for them to focus on. Would it be nice to see some models get updated in the future? Yes of course, should it be a priority to appease the 0.001% of people who will even notice (nevermind care)? No.
It's still an R32 at the end of the day. The old saying goes, "If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck".