Bungie needs to add back footage of Campaign and Spartan Ops gameplay. You never know if you want to put a screenshot or see a fail, you never thought of seeing.
If it was firefight I'd see the point in learning how other players get deep into waves but campaign and spartan ops?
I don't particularly get why you'd want to record against the AI either.
Have you seen some of the Fails of the Week on Halo Reach? You usually see some on YouTube.
Not sure I understand the appeal of recording clips against AI.
It wasn't added to Halo 4 because of engine changes and rendering issues. 343 might do an update in the future to put it in.
343i runs Halo now. Bungie abandoned Halo over a year ago.