He was against the joystick control idea.
I don’t know why this came to my mind. But I feel like he did not want to see Vainglory going this path. Clearly, it’s perfected for touch. And all of the heroes back then were designed for touch control. So he fought. And then he lost the battle and gotta go. Resigning is a way to protest.
This is totally fiction.
Note that this post got nothing to do with dissing or bashing the joystick control. I don’t have any comment with Vainglory implementing the joystick control because I will stick with touch control anyway.