You are right, they might matter to the 5 or 10 guilds that are into world firsts but they don't to me. Its not so much my playstyle as it is the game design. If there was a reason, other then haha I called off work and we killed the boss first, to get a world first, then it might matter to me.
The thing is though, hardcore guilds are not screwed because everyone of you is in the same boat. Now, if they released the content to one server a day before the other, you might have a valid complaint. I honestly don't have any sympathy for people that take off of work, to get a world first, in a game it just doesn't matter in. I haven't seen any unique titles saying "We killed it first evah".