My guess is that the new rules are there to make it a little more fair for everyone. (They're getting quite similar to Timitu's Lilymud Secret Santa now, actually :P) With full body drawings + backgrounds being a requirement, you'll know what you get, so to speak. I've been disappointed in the past when I've poured my heart and soul into a full colour piece for a Secret Santa only to receive an unshaded headshot drawing in return, so I reckon that rule is there to prevent that kind of thing from happening, which I think is a good thing