I'm starting to get a better picture
I just can't, for the life of me, figure out how this whole "multiple rule book" situation is allowed to exist.
Like I said, I'm very new to a lot of this, still have a lot to learn, and am missing a lot of the history. However, as a sort of, "outsider looking in," the current paradigm seems nuts!
From a customer perspective, if I'm buying a GT car, I would want the option of being able to enter it in as many events as possible. If I understand correctly, you would need a seperate GT car to compete at each of the Le Mans 24hr (GTE), Nürb 24hr(GT3), Spa 24hr(GT3), and Daytona 24hr(GTD) ...well I think Nürb and Spa would be the same, but still, 3 different cars for 4 events
If I'm a manufacturer who has decided having a presence in GT racing is what I want, my priority would be to build the car that has the largest customer base. That would be GT3? After that, a decision whether or not to build the other cars is a simple financial decision. Can I turn a profit from the smaller market, while still providing a competative product?
In the case of BMW, while it would be nice to see them at Le Mans, from a business standpoint, it's not surprising that they wouldn't build a GTE car.