: Halo saved films operate by replaying the input data in the engine and
: letting everything come out the way it did the first time. It's all 100%
: deterministic and relies absolutely on being able to utilise old versions
: of the engine that matched what was used when the saved film data was
: created. Otherwise, the original events of the match and the recording go
: out of sync when the results of calculations - small or large - don't
: match. You'd get players not dying or walking into walls, the score going
: wrong, etc. etc.

: I believe someone at 343 Industries said that they wanted the ability to
: update the MCC often and quickly. As a result this version compatibility
: could not be maintained, and the permanent saved films feature was
: dropped. It was suggested that players use the Xbox One DVR feature to
: permanently save footage of games. Also, any time there is a patch for the
: MCC, the recent films list will be wiped.

: Take from that, what you will.

Okay, well at least we might have somewhat of an explanation as to why it wasn't included. Still a bit disappointing though.