https://www.gamespot.com/articles/destiny-2-pcs-key-differences-graphics-controls-re/1100-6454279/

Bungie partnered with Vicarious Visions to make sure Destiny 2 is specifically tuned for the PC and has the look and feel of a game that's true to the platform. This meant having a seven-week release gap after the console versions, as developers stated that the extra time was spent to get it right. The game is also going to live on Blizzard's Battle.net ecosystem and uses some of its functionality--like the friends list and chat/whisper. But what else separates this version from its console counterparts? And what specific features are offered for PC players?