Mainly a difference of perspective from those in the UK and those in the US.
Here, we have a lot of open boring freeways and driving for hundreds of miles at long stretches, mainly going straight, is not uncommon. For those reasons, many drivers of sportscars in the USA will want cruise control (which I am sure could be offered as an aftermarket thing). I know that after driving for 1100 miles straight, doing so without cruise control is painful.
Some may equate wanting cruise control as a luxury item, sort of like wanting DVD navigation and heated leather seats. I think it's not, but a cruise control unit does add weight and that is going against the concept of a very simple and lightweight car, that designed around performance. But then, so it a radio/CD player so there are some compromises that fill a gray area. IMO.
One of the compromises will also be that oft-sneered at cupholder, the symbol of the bloated SUV. As has been discussed here before on other threads, I would like a cupholder. Even if it's symbolic to many of all that is wrong with heavy cars, it's really only a few ounces of plastic that is hidden when you race. And again, on that 1000+ mile drive in one day, I need a place to hold my coffee or water. I would not consider a cupholder as important for driving around town.
I will happily add a couple pounds of crap and meet someone with 100 pounds less on a track and we will see how it stacks up.
