Quote Originally Posted by 'Stabface',index.php?page=Thread&postID=128119#pos t128119
I dunno. It's just what Blizzard has decided.
Indeed. This has been clearly stated as a change in direction by Blizz. To quote Blizz poster Ghostcrawler:

"To be clear, this is a change in design for us. We used to say that hybrids and classes that brought big buffs had to ride in the back of the dps bus. We're trying something different this time around, where everyone brings buffs and everyone has the potential to do dps. "