I totally get it, but for some of us the prices of these vehicles is up there. And besides, we have this notion of mechanical sympathy. You'll see us in the company garage walking pretty far to park away even though our vehicles are quite ordinary. At any rate, it does feel as if a custom order, is between the dealer and GM, not the customer and GM. Haven't seen anything yet to the contrary. The fact that a customer can't get status online and must rely upon the dealer or chat GM, is a red flag, at least to me. On a positive note, there has to be some code of honor when doing business. If a dealer makes a person wait months then sells the vehicle to a higher bidder, that's not great and surely it would be reflected somewhere.
edit p.s. I just went to the website and put in the 6 digit vehicle order chatting with the virtual assistant. It said your dealer has submitted your order, but it has not been officially accepted by GM. That was very easy, seriously. And interesting both the dealer and the virtual assistant say, "Your order."