In the forge video for Impact, when he opens up the menu for the trait zones, there is an option for fall damage?
So concluding from that, fall damage is a custom game type mechanic. One thing I noticed is that when the settings for fall damage are changed, instead of being changed from ON to OFF, it’s changed in percentages. So falls could also be changed from something such as only dying from a jump from outer space, to (possibly) dying from jumping down something 3 feet tall.
Which means that you could have different Matchmaking playlists with or without fall damage, all depending on the game type.
This also means that classic playlists can stay true to the classic Halo game types, and the newer modes can keep fall damage from Reach.
Just something I saw when I watched the video another time through, I don’t know if someone else has posted this or not but what the heck, might as well