It was changed because players were shrinking the clipboard down and using it to block the sun.
Having the sun blazing away is a game feature. How many time dids you read a story, watch a movie and they talk about how "the enemy dove out of the sun".
Silly, nay...outright stupid reason. Any idea how hard it is to move the clipboard around AND keep it where the sun is while your in the middle of a fight?
How many time have we heard of pilots putting their hand up to block the sun. Hell. How many times have you done it yourself IRL.
There is no hand to raise in AH. The clipboard is the closest we have
They also tended ot wear sunglasses. Which we also dont have that option