@Moonfaxx:

How? How precisely does giving some other guild the option to beat the raid on a slightly easier difficulty at a later date lessen another guild's achievement at beating it at the original difficulty?

I could almost sympathize with the people who were complaining about the Firelands nerfs; there is some amount of merit to saying "we just want to be able to keep going at the original difficulty, no matter how long it takes us." However, in this case, that's not an issue. Any guild that wants to beat the raid as it was at launch will still be free to do so by turning off the buff.

So more people out there can get the achievement you got. So more people have the neat mount you got. Big flippin' deal; that in no way effects the fact that you worked harder for it by getting it at the harder difficulty. The only possible way it effects you is that someone who doesn't know any better might think the guild that did it with the buff was as good as you. So, if you're really making the argument that a larger portion of the player base shouldn't have the ability to turn down the difficulty to a level more manageable for their group because you want to stand out more, because you want strangers who couldn't care less to know how much better you are than everyone else; I'm afraid that's not very compelling.

You and your raid mates will always know what you accomplished and how hard you worked for it. If you really feel that it's not enough to know it yourselves, that others must know it to validate your success, well, I'm sorry, but that's just being insecure.