You're forgetting that the upcoming Title Update for Reach will allow 343i to modify the game in certain playlists to be able to create a feel as close as possible to Halo 1 multiplayer beyond what Bungie could previously do. They didn't want to put in Halo 1 multiplayer into Anniversary because they were afraid to split the community even though they would have loved to do it.
I suggest to wait to see what they'll be doing with the TU before deciding anything.
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