Yikes, not the best pictures I've seen.
However, I remember reading or hearing somewhere about how BMW made an extra panel to reshape the rear and hide its true design, leading to the frumpy looking rear again. Hoping that's the reason why.
The LCI GT (the one I have) definitely did improve the rear greatly over the original pre-LCI, but I still think the roofline should've flowed into the lower line of the trunk rather than form a little lump on the rear end. Also, get rid of the ridiculously high suspension (and awful wheel gap) from the factory. It doesn't need to be any taller than a G30/G12; that's what kills the looks.
