No, third party apps are just better and offer more features.

However, it would be handy for when half the people of the group are on PC and the other half on console.

Lol about Yoshi P saying he's not offering ingame voice chat because it can become a requirement, well guess what, there's groups out there where PC player is requirement just so you all can be on the same voice chat.
No in game voice chat because they don't know how to do it, they don't want to spend the resources and/or 90's server hardware and spaghetti code.

Personally voice chat has always been a requirement for me whether I join a group or make one myself (especially in Destiny), friends or pugs make no difference. Of course I'm not talking about the easy stuff.
So much easier to coordinate and talk while battle when you can't type. Not sure why so many people are against it. Voice chat has always been a huge factor in improvement and leads to higher change of succes when doing harder content in any online game.