Multiple reasons: 1) the user can actually see the color, 2) the iMac is instantly recognizable, instead of a totally generic screen, and 3) Apple likes it. There are no technical reasons for the chin, since all the components would pretty clearly fit under the screen, so there are obviously aesthetic ones.

Not sure how you can claim Apple got rid of the “L” battery to cut costs, when there is clearly no room inside the phone to fit a larger battery of any shape…

I was wondering the same thing. I remember The Verge mentioning that the tweeters actually fire downwards and reflect off the table, but I can’t figure out how that works either…