The chat which doesn’t show up on old.reddit? So if someone sends you a message on it you miss it? The one you have to disable on new.reddit so people only use

The chat which doesn’t show up on old.reddit? So if someone sends you a message on it you miss it? The one you have to disable on new.reddit so people only use PMs? I missed tons of sales on BST subs before realizing people were sending me chats on that.