I understand. I've been playing the game since day 1.
The reason it is an issue is because I map the buttons on the keyboard, to the controller. The left hand holds an Xbox Elite 2 controller, the right uses a mouse. If I attempt to play with the controller and the mouse without a mapping tool, the system freaks out and attempts to switch back and forth between controller and mouse, resulting in in unplayable game.
Example. The W key is mapped to the "joystick up" controller input. A key is mapped to "joystick left". Left Trigger is mapped to whatever the look down sights key is. Etc. The system then recognizes everything as a key input from a keyboard, and it never recognizes the existence of a controller (hence why no aim assist)
I then use my right hand to control the mouse. Like many mice, I still use the programmable buttons on the side to map certain inputs, such as pushing right on my scroll wheel will press the melee input.
I'm not just holding a controller or just using MKB, I'm not using a keyboard at all and need something to map the key to the controller.
I play EVERY PC GAME THIS WAY. I just need to find alternative so I can pay this game I freaking love and poured hours into. "Just uninstall" isn't an option.