Long tail streamlines the car and reduces drag. High trunk lid increases downforce (it's basically like a wing) and gives you more storage room in the trunk, without increasing drag significantly. You'll also sometimes see a small lip spoiler pressed into the metal of the trunk lid like a "gurney flap" spoiler for more downforce. So since the 2002 BMW 7 series and the 2003 Maybach cars, the first cars with this higher trunk lid concept, car companies ever since have been transitioning to higher trunk lids. They hide these proportions by changing the placement of the tail lights. Another note about taillights; notice Mini Coopers - their taillights are HUGE! This is so that way the rest of the car looks small. I'm saying too much, as I'm not a published expert in the car industry. That's Cazalea's department. But I have worked in the automotive industry, so I know a tiny little bit.