[PyComfy]

34yo here, got called a cheater constantly, even by "top" players. Despite using a slow sensitivity myself, i would say that slow/fast sensitivity or wrist/arm aiming doesn't matter; I have seen plenty of people being very efficient with each technique. Just use what you are the most comfortable with. Something specific that tremendously helped me is putting fingers on each side of the mouse to lift it a little, the mouse is no more touching the mousepad, only your fingers, that way i can stop moving much more precisely. You no more think about aiming with the mouse but with your hand. When i need a slower sensitivity, i just lift the mouse higher. In the past i was playing with a CRT monitor at 160hz, now i am playing with a IPS monitor at 144hz (LG 27gl850-b); i have seen no difference in performing at KovaaK aim trainer[1]. Something that actually made a difference is where the sensor is located under the mouse. More the sensor was toward the back of the mouse (toward the wrist), more my aim was degrading. I also once tried a vertical mouse (Trust GXT 144) and did my best score ever in tracking, it was like holding a pen.

[1] https://store.steampowered.com/app/824270/KovaaKs/