First off, your video and document were well done (although you should review the process for enumerating your paragraphs 
I’m going to go out on a limb and guess that you are a competitive player. You really care about rank, and you want it done right. I get that, and I’m not against what you want. You may, however, have put a bit too much thought into it. Let me explain.
> Social Ranks
> - A progression system based on experience or time playing game.
> i. EXP, Credits, etc. per game played
> - Should NEVER max out.- Should be publicly available as status symbol on profile and next to gamertag in matchmaking- Winning team gets 10% boost
> ii. Use EXP, Credits, etc. to buy COSMETIC upgrades
> - Cosmetic items are sustainable; gameplay-changing items are not (players buying your game after release will be at disadvantage in matchmaking)- Halo magic includes even playing field… shouldn’t be able to buy weapons, abilities, armor, health, etc. (Guy who plays basketball a lot doesn’t have a shorter hoop, right?)
> - Should comprise global social rank AND playlist-specific ranks
> i. Rewards players who specialize in SWAT, BTB, etc.
> ii. Helps players make friends over Xbox Live
>
> - Global social rank should require 800-1200 hours to max out
> i. EXAMPLE: Halo Reach Inheritor
>
> - Playlist-specific social ranks should require 400-600 hours to max.
>
> - Social ranking system should tie in cohesively with competitive ranks.
> i. See: Competitive ranks
> ii. EXAMPLE: Halo 3 global EXP, global rank, playlist EXP, playlist rank
> iii. Keeps players interested in both systems
>
> - Playlist Count
> i. Social playlists should comprise ~75% of playlist choices
All this was well thought out, but it only matters if you are a competitive player. If you are a casual player you will spend most of your time in a social playlist playing other casual gamers. None of us care about rank. To be sure, if there is a rank, and it goes up, that’s kinda cool. But if there is no rank at all, we won’t notice. We also don’t care what your rank is. We’re in the social playlists to get away from all that. How you get a rank or how long it takes to get a rank just doesn’t matter. If rank matters to you, you play a ranked playlist. That’s what they’re for. What you’re proposing here is to have just as much pressure to win in a social game as a ranked game, and that’s just -Yoink-. At the end of every Halo match there is a score and a leaderboard. That’s all we need, thank you.
Matchmaking
Halo 2 was the last time the developer was allowed to make their own matchmaking system. Bungie used Elo. Starting with Halo 3, every Halo game, every game on Xbox Live that has matchmaking, used TrueSkill. Bungie used TrueSkill’s results to assign a rank, and the term “skill-based rank” was coined. To this day people still look at your rank to assume your ability to play, even though Bungie detached rank from TrueSkill with Reach. TrueSkill still does the matchmaking, but it hasn’t had anything whatsoever to do with rank since Reach.
None of that matters any more, because now Microsoft has a new algorithm called Smart Match. Notice that they avoided the word skill and featured the word match. There are not a lot of details available at the moment, but the hype suggests that Smart Match will do a better job of finding players that a)play like you do and b)want to play what you want to play. I don’t know if individual developers can modify any of the parameters, but I certainly hope not. What will be most interesting is whether or not Smart Match can tell if you are playing on an account that you personally leveled up. Leveling up new accounts for the express purpose of selling them, and people playing on those accounts is what led to the demise of the “visible skill rank”. If Smart Match can detect bogus accounts then we can have VSR again. If it can’t, it’s not likely.
The main point in this instance is that you are basing your matchmaking wishes on TrueSkill’s capabilities, and Smart Match will probably work better anyway. However, if developers are allowed to tweak Smart Match, 343i should consider your proposal