Analog actions are most efficient with an analog input. Digital actions are most efficient with digital inputs. Converting either way loses resolution or efficiency.
If you play a game with analog movement, an analog control works best. Most games have analog camera/viewing so use the mouse for that. Abilities here are all digital so a digital button works best.
Some games are built for two analog inputs. Only these games is a dual analog controller acceptable because dual mouse isn't a working standard. However a mouse is a better single analog input because the moment arm of the function is .. Well, your arm, which has greater resolution then your fingers.. Unless your sealed in a cast or have a shattered arm but working fingers ;p
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