Because they like cars, and like us, they like to have fun.
Unlike the manual, this does make sense to the bean-counters, as increasingly Americans demand power routed to all four of their wheels, whether they live in northern states or not. It also means you can sprint to 60 mph in just 3.9 seconds. Which is nice.
Jaguar says more equipment will arrives as standard in all models, but beyond that, not much else has changed for 2016, which isn't a bad thing at all. We'll have to wait until a later date to discover if the price has changed, however, but with the news of a stick on offer, most enthusiasts will be happy regardless. Even if they don't actually buy one.