As an owner with a low VIN my thought is that Supercharging was billed as A thing (e.g. "85kWh cars are supercharge enabled") not something with various levels. When I bought the car I knew it didn't have back-up sensors or power mirrors; I thought it was Supercharging enabled, not Supercharging-lite enabled. After all, the window sticker just says that Supercharging is INCLUDED and is silent about charge rate.
I get that Tesla will add new features as they go and as a Model X reservation holder I'm exited to see what they add next. Supercharging, however, was billed, IMHO, as a concrete thing not something with levels to be determined later.
Anywho, I've been feeling uneasy about this whole thing and I guess this is why. As we all get used to EVs things like this will be better understood but for now Tesla will have to deal with the (potentially unfair) expectations of customers. Gasoline flow rate isn't a concern with ICEs but DC charge rate is for EVs and, until very recently, I thought my car was capable of full Supercharging when it probably isn't. I'll adjust and get over it but I've learned something.