they tried moshlists in BO1 it was not well received and was complained about until removed. Those who like only one type of game play would not accept or tolerate it in a moshpit and having to fight over it each time when voting for maps. One of the reasons moshlists have some of the lowest player numbers in them compared to standalone lists.
A moshpit needs to be community and developer coordinated. The BO1 HC moshpits failed because they came with no notice and were formatted poorly.
Bombs: Sabo, SnD, Demo. Terrible playlist, that was barren in a week. Sabo has been a dead game mode since COD4, it was finally cut out in BO2. SnD already had its own playlist that remained, pointless. Demo was terrible in BO1. No one wanted these game modes in HC.
Flags: HQ, CTF, DOM. These game modes had nothing in common, and were extremely popular amongst the people that played them. No one was happy that HQ and CTF were mixed, and we revolted until it was correctly reverted back to the way it was.
Moshpits can be accepted, but coordination is required. They are never coordinated, hence they are never successful. Treyarch responded in BO2 by ignoring us, maybe IW will take HC forward again.
Some would agree with you but diehard fans of one game mode only would disagree and not tolerate it at all. Either it has is own list or nothing is the mentality of some people who play the game. For they would say it is not fair that list abc has its own lists where their favorite game mode does not and is in a mosh list.
I understand your guys' posts about the moshpit. On one hand it is nice, but if someone is just wanting to play CTF it really kindof stinks as they have to constantly back in and out of games till they get one for CTF. The system is ultimately manipulated and makes the matchmaking much more complex and cumbersome.
Some of this could be "fixed" by changing how they create the lobbies and whether they allow people to back out of lobbies. Maybe first they make the lobby and once they get enough players (random...don't show the names) then they lock the lobby at which point the names can be shown and you can now choose between 2 game modes or "random". If you somehow back out of that lobby (dashboarding for example) then you would be flagged as backing out and some sort of probation system could be put in place. It's a different model and has never been COD's model so not sure if we will ever see this sort of solution. I'm not 100% convinced in my own head that it is a good solution, but it is an option they could consider (for the next game anyways...not Ghosts).
One way or another, I want them to not give Core players the only DLC playlist but instead create 2 playlists for the DLC, one for Core and one for Hardcore. They can be moshpits if so desired. It is very frustrating that these new playlists are only Core. 24x7 Nuketown is another example that was only available for Core players and not for Hardcore.
Never hurts to remind people of what happened and how and why so they don't repeat the same mistakes over again. The overall community is still not going to accept it if they try it again. People are still going to complain about it and droves.
Very few people really like or tolerate mosh play lists.