Skype, Discord and Teamspeak (not sure about Mumble) all have mobile/IOS/Android variants so if you don't have a laptop you could get one for your smart phone and are just as convenient as their desktop versions so PS4/3 players aren't handicapped by the lack of ingame voice chat capability.

For individual limit breaks, you may want to try PVP as it's there but it's only LB1 iirc. That said, if they were to add it to PVE they would have to redesign the system and rebalance alot of things like say if everyone had LB3 ready, it could possibly break some ingame mechanics of certain raids and trials (esp with tank and healer lb3 up at the same time, it could lead to cheesing certain things). It would be nice to have individual limit breaks for PVE though if they could pull it off properly without breaking things. ^^