The whys have been convered ad naseum in other threads so I'll simply add;
There are anyones who use MBPs where lights or sun cause glare problems that can't be resolved by "readjusting" the MBP. Many anyones use MBs for other than graphics editing. As Apple is so fond of pointing out, there are many divergent uses of the MBP, including running Windows. We are not the Borg. Choice is a good thing.