GH definitely hits the nail on the head here, but its also just part of the people who host the games naturally evolving their preferred hosting style/games. When you allow dead players to post or people to PM it does change the balance of the game a bit, or at least some of the potential outcomes.
Out of thread communication has its own problems: Networking isn't something that is fun for a lot of people, a lot of work can end up being done outside of the thread rather than in it - often ends up being a group of people who have a clearing role or action deciding a lot of what happens. Also typically requires more attention from people to respond to PMs and conversations. Really it ends up changing how the game is played a little too much.
Dead Players Chat: Not fun for mafia, they get no use out of it, and the people they kill despite not being able to vote, can still talk, when you kill someone its for a reason typically and usually its because you dont want that player to keep talking/performing an action. Not being able to participate after death gives kills some actual weight - the thread loses a voice. We've also shifted from nightkilling the same players early game over and over so its no longer a participation thing either where people are being robbed from playing the game.
Both also provide balance issues in terms of roles and reveals, you have to keep the dead chat + private communication ability in mind when putting roles into your games. Having a cop (not that we play with cops much) that can PM his villagers with his results and get them to fakeclaim for him, etc could be horrendous for mafia.
We've also shifted from alignment reveals to alignment + role reveals which is a mixture of personal style and necessity for the setup.
Around 2015 is when a lot of Orgahs starting properly branching out from here onto other sites and ideas mingle.
I think you could get a game running with out of thread mechanics or dead chat (or both to some degree) going but in the end it provides a more streamlined, more 'fun' experience without most of the time. I have positive memories of both, but no real desire to return back to those times, I think the changes are for the better, its just part of the evolution of how mafia is played. We started with cops, realised they aren't much fun, so we don't play with them, or jesters, or what have you. Hosts and players slowly work out good and bad combinations.
EDIT: Something like Capo or Pirate Ship require private communications and that is an integral part so no complaints there, its just for a lot of regular setups private comms isnt quite as necessary.
In a vanilla game you could possibly get away with using them though, for sure.
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