WASD established itself as a common control scheme for two particular kinds of gameplay choices.
1. In games that use both keyboard and mouse, if you use the mouse with your right hand, your left hand usually rests more comfortably on the left side of the keyboard than by the arrow keys.
2. In games which only use the keyboard, WASD allows one to perform directional input with the left hand instead of the right hand, which some may be more comfortable doing (especially those who are most familiar with console controllers and gamepads with left-hand directional pads). Settling for WASD is a…