It's also fine by me as the current crop of driving sims (with some exceptions) have IMO become somewhat unfocused and diluted with the devs throwing everything they can, including the kitchen sink, into them, which, given the workload in doing that, is probably responsible for the slew of bugs in the current titles.
Now don't get me wrong, I thoroughly enjoy the sandbox nature of GTS PC2 and AC, it's just that sometimes I wish I could load up something with a specific focus on a particular class of motor racing (other than F1). Yes I know that I could use the aforementioned games to roll my own events, but that's not the point for me.
I know I'm in a minority here, what with most everybody yelling for more cars and more tracks, whereas I would love a game, or games, that just focused on one aspect of the sport, which would mean only the cars and tracks used in that series. For me at least, I think that would lead to a more coherent and well rounded motor racing experience. It would also give the devs the time and space to focus on the technicalities and minutiae that would lead to a good polished title.
And that is why I am particularly interested in ACC.