I have been playing Atlas for a while now, and using the xbox controller, as i used to do in Ark, i could never go back to keyboard and mouse totally.
The issues i have noticed are that some controls do not seem to work with the controller active.
Namely, The H key on keyboard does not show hud info or resources, works fine with game-pad disconnected.
The fire trigger with Lions, does not pick up other animals, mouse click does not work either, unless you disconnect gamepad.
The mini-game for water, and reloading your weapon, does not stop the marker with trigger on xbox controller, even though the left and right trigger is supposed to be same as left\right mouse click.
There are probably more that i haven't found yet, but these are the most annoying.
So either some xbox pad controls are not functioning, and having the xbox pad connected actually stops some keyboard commands from working. Please fix asap devs.