Because most people are right handed so wasd allows for right handed mouse use?
There are more keys available for other functions in the keyboard as well. ESDF and for some RDFG are even better than WASD for a similar reason.
Here I am using the mouse with my left-hand but WASD. I should try the arrow keys again!
5123 on the numpad is the lefty WASD
I remember playing Wolfenstein 3D with the mouse. There never was a question of what the mouse was for. It was for looking. The only question was what part of the keyboard to use. I started with arrows and Ctrl/Shift and used that for many years.
Can’t remember what game made me switch but it was when the controls became more involved with reloading and healing and such requiring specific keys and being very commonly used during gameplay. Probably Half-Life? I know it wasn’t id Software’s games, at least. Mmh… I’d love to remember, now.



