Any official statement about backfilling/joining games in progress not working?

Title, has Activision/Iron Galaxy even acknowledged the fact that lobby backfilling/matchmaking coordinating players to join games in progress isn't working?

A staple feature of multiplayer games since damn Quake 2, which came out in 1997, being broken is ridiculous, I have no idea how they messed this up considering it's such a necessary, basic feature, it's like if Counter-Strike only allowed you to join casual matches during warm-up & never after the match starts.

Out of any game to NEED this feature, it's absolutely Call Of Duty, I refuse to believe they tried everything they could to fix this issue, because they have tried nothing outside the box to counteract it like introducing bots to replace quitters or even a whole ass penalty system for rage quitting.

They have the source code & ability to implement new systems if the old systems require some sort of 360/PS3 networking weirdness to fix the backfilling like what I mentioned previously.

I guarantee you nobody would willingly rage quit if you lost XP or they penalized the amount of XP you earn, they could also pull some funny shit and penalize people's GAMEPLAY like forcing quitters to use the pre-built classes or remove kill streaks from their loadout, etc.