http://www.pcgamer.com/bungie-says-destiny-2-clan-chat-is-one-of-our-highest-priorities/

I've been sinking quite a bit of time into Destiny 2, as you do, and really enjoying it overall. But I find it endlessly annoying that it's so tremendously difficult to communicate with anyone. I am literally surrounded by other players, and all I can do is The Macarena. Even connecting with clanmates is an unnecessary hassle. 

That will hopefully change in the not-too-distant future, however, as social designers M.E. Chung and Steve Dolan said in the latest "This Week At Bungie" update that they want better communications options in the game too. "Getting clan chat into the game is one of our highest priorities, and we hope we can get it into a release as soon as possible," Chung said. Dolan added that Bungie is looking at Tower and zone chat options as well, "but we have to prioritize it against all other asks."