I know this has probably been brought up more times than it should but it just seems like a necessity more than a luxury with FFXIV ARR.
With the Duty Finder partys especially- it would be so much more feasible to do end game content using DF if an in-game party voice chat was available. Plus a party voice chat would take out the aggravation of trying to access a voice server of a stranger who you might never run content with again.
Now we have the release of the PS4 and those players without any other means to hook in their headphones or download a software program for voice chat will be very much at a disadvantage during the end game content.