Why Didn't Every Ford GT Look Like This End-of-Run $1.7 Million, 800-HP Mk IV?

Ford recently released a number of reportedly "final" GT supercar versions, each of which begged the question, "Is this the last one?"

The finally final, completely end-of-the-run GT is here

and it looks so incredible that we briefly forgot about the concept of many final models.

 Instead, we're now perplexed as to why, since 2016

every GT has essentially had the same design when Ford could have, at the at least, 

 made some of them resemble this fantastic Mk IV special-edition model.

spoilers, and other features. Considering that it is advertised as a track-only special, these parts do make sense for the goal.