According to quick google search, it works like that in LoL and SC2 but in DOTA2 and CSGO your hidden MMR and visible ranking (of course you just see your MMR in DOTA2 so it doesn't really count) rise at a similar rate even during winstreaks.
It doesn't really affect smurfing anyway. You just intentionally throw a few games when you start facing against people in the higher divisions.
I'm not sure where you found that it works like this in SC2, because it totally isn't working like this for smurfing. And remember, we have been talking about this special case. I've seen several Grand Master players (top 200) starting a new smurf account, losing all the placement matches on purpose and then ranking up. As soon as they are placed Bronze and won 2-3 matches, they already started to get Gold and Platinum players, because their MMR was increasing or too high for an actual Bronze or Silver player. So, your MMR is not tied to your rank or the division you are placed in, but it affects the players you are finding.
In reality, if you are not smurfing, your MMR will have a correlation to your rank/division, of course. Higher ranked players will have a higher MMR obviously. MMR systems usually try to put you on a 50% win-loss ratio, which when you hit it, is for every person different. Some will hit that limit in Silver and others will hit it in Champion. As long as that works there shouldn't be a problem with the actual ranking system.
Hope 343i has a live ladder list for at least the top 200 players. Similiar to this SC2 Grandmaster list:
http://eu.battle.net/sc2/de/ladder/grandmaster/heart-of-the-swarm
Join in progress is a plague. (IMO)
JIP only works in modes where the player count is high. It just doesn't work for 4vs4 modes, where each individual skill is crucial to the outcome of the match.
The only reason why it works in games like BF is that 1 squad can completely dominate the game, so individual skill is weighted less, especially since the modes are 32v32 players. It's basically ideal for a 12v12 mode like Warzone.