I was actually just about to make a post saying that I liked Perfect Team because it
didn't have all of the jibber-jabber of the online leagues.
I just plain don't like talking to people.
But I think a lot of solo players have the same preferences I do. They just want to involve themselves in a game. PT is currently is a feature that both solo and MP players can enjoy and it is well done. I didn't think I'd like it much and I'm pleasantly surprised.
As long as chat/mail was just some thing that you had the option of switching on, that would be cool. But I wouldn't want to get unsolicited messages in my inbox.