This mod enables accessing chat and viewing the states of other players in the lobby while in the inventory, blackmarket, preplanning, Crime․net, skills and perk deck selection screens.
That was a copy-paste from the originals description. As of the version the game is at today, we already have a chat in inventory and other places. That however doesn't mean there aren't any new places to add the chat, such as when looking at the safe house or doing your offshore payday. That being said, not only does it add the chat to some guis, but it also adds states of the players, that are in the lobby with you.