Because those people aren't who this expansion is for. The vast majority of players, as Adam himself posted today, isn't even level 80 yet. I've only barely hit 77, and that's after taking a week off while having to travel during Thanksgiving. High-end guilds and players who rushed to 80 may be whining that they have finished all the content, but the vast majority of us are barely halfway through it. You just can't run Wrath at Sunwell speeds, and frankly, that's a good thing.
Because there's so much more to do -- I wonder if all of the players angry that they've beaten Malygos have gotten all the Exalted rep they need, have picked up all of the Wintergrasp gear that they want to pick up, or have leveled a Death Knight up to 80 as well. I wonder if they've toppled all the Heroics (even Adam says the Heroics can be hard at times), or finished off all of the 25 man raids also. I wonder if they've earned every achievement point yet. I wonder if they've finished all of the amazing questlines to be found in Northrend -- from the time you step off of the boat to the first glimpses of Icecrown Citadel, there are tons of great things to see and do.
And if they have beaten all of that and conquered everything, then I suggest they go outside, or find another game -- I hear Final Fantasy XI has some challenging encounters they might enjoy. Yes, hardcore players will blow through PvE content in Wrath, but finally, as we've been saying since the game first started, this endgame isn't for hardcore players any more. People who want more can find it -- we haven't seen a player yet who's finished all of the achievements, and we're more than happy to post about anyone who goes an extra mile and solos content or does it better than everyone else. But the normal endgame -- the game designers worked so hard on -- is for us regular players now. The biggest group of players in the game is now able to play and enjoy the best content. Maybe Ensidia can go get world firsts somewhere else, at least until the next content patch.
And of course we should track raiding progression -- as we say in Guildwatch, it doesn't matter whether you're killing Van Cleef or Kael'thas or Sartharion: a down is a down, worth every wipe. Downing bosses in an MMO should be about teaming up and killing content together, not who can race to have the prettiest pixels. If your guild can beat the endgame, grats -- why shouldn't other guilds be able to do the same thing? And why shouldn't they get congratulated when they do?
"But that makes it meaningless," you say. "Everyone can win." And now you're getting it: it's an MMO. Everyone's the hero. Whether you take your sweet time questing around the new zones or push straight to the endgame to topple the big bad bosses, you too can see all of the dungeons and all of the encounters in the expansion. Nothing wrong with that at all.