Lack of communications isn't due to the class system, IMO, it's due to how the content is designed (i.e. piece-meal, easy, short and fast content that need no communication).
Back in WoW I hated that to experience a different class, I'd have to grind through all the levels, collect all the gear and do everything again. It's much better this way in FFXIV IMO. Although I do agree that the class design is the elephant in the room right now.