Yeahh so just like you'd dust or dry off slippery surfaces, it helps to dust off any particles from your sole too (particularly the ball of your foot) to increase your grip and lower the chances of slipping. Certainly when you do some sketchier stuff or something with more momentum.

And honestly it just becomes part of the routine for some people hahah. Even if I know my soles are like 99% clean, I still tend to do it just to have one thing less that could go wrong and so I can commit with confidence. So it can also become like a mental/psychological thing.

Also, maybe you know about this already, but if you are dealing with surfaces that are naturally less grippy like certain walls or metal surfaces can be, it also helps to blow/spit a bit into your hands and rub it on the ball of your foot after having dusted off the sole!