http://www.pcgamer.com/destiny-2-will-keep-aim-assist-on-the-pc/

Destiny streamer DrLupo caused a stir in August with his testing of the aim assist functionality in the PC version of Destiny 2. Aim assist is disabled when the game is played with a mouse and keyboard, the mouse being inherently more precise than a controller, but running the setup through a XIM4 module allows it to be reenabled. The point wasn't that aim assist would give people on PC an advantage over console players, however—"The XIM still involves translation, which means it will never be as precise as a native mouse," he wrote—but that it could be perceived as such. 

"People will look for anything to blame. The XIM is a usual suspect, depending on opinion, so people will point fingers without any personal experience of their own," he explained. "Players are shaming others for using a controller. This means the 'ego' issue is already at play. And we're not even done with the beta."