ORIGINAL: Venthos
Real simple reason. It would cost Chrysler money to offer more packages. Why offer packages that the EXTREME minority would choose? Chrysler is not about to go into further debt to offer options that will be chosen on less than 1% of Challengers if even that. The vast majority of future buyers would not give the car a single thought if it didn't have some of those basic feature like A/C. No dealers would order cars with those options. Chrysler would basically be offering custom options that only a handful of special order folks would buy.
Sure it sounds neat to a select few, but no matter how you slice it, it makes zero business sense. That is why it is not offered. You are welcome to strip out all of that technology once you buy your car.
You know, all that you said makes sense, but here's the thing that gives me pause: back in the 70's, all the manufacturers seemed to offer a bunch of options just fine, and computers were in their infancy. Not only that, but the Big 3 ruled the world. It wasn't until they tried to get all fancy with cost savings, doing the badge engineering thing, that things went swirling down the toilet.
If anything, given the levels of technology that is now available, we should have more choices, not less. That way, more people like the OP could get exactly what they want.