If you live in a fog bank and you are working with a leafy strain that is sensitive to PM, yes -- yes it does benefit the plant.
So ok... you have PM issues and you want to pull a leaf off of the plant... Now you just exposed the plant to not only PM, but all other pests, fungal infections and diseases.
Give you plants better space. Why are you working with PM prone plants in the first place?
The way you fight a PM prone plant is NOT removing leaves... That will make it worse.
If you have this issue read up on how to deal with PM.... they will tell you most likely that cutting out a bad area is a good option.. And it is if you are already to that point... But as a practice, no, it is not the best option. Solve you environment issues first...