If you don't like that look then I guess you don't like the rear end of the current generation especially on the GT3 and GT2 models that have black cladding to a similar extent.Why mess with a formula that's been working for you for decades. Don't know if I like all the additional plastic cladding on the rear bumper, but I know these are still 'prototypes'.
Standing out in all ways, not just with performance, might have influenced that decision. Fortunately darker color LFA's help to blend in the rear end.The only aspect of the LFA that made it ugly were those giant rear vents on the bumper. I know there were designed to decrease drag, but they could have made them much more subtle looking imo.