day 14 of flower i lollipop, and after that i dont touch shit...
Fan leaves provide energy for the plant in veg. Going thru stretch u can remove the very top fans and reduce the amount of stretch.
After stretch the plants use the sugar leaves to provide energy for the flowers at which time your fans are nothing more than reserve energy sources for the plant.
If your feeding your plant exactly as needed the fans have really no need.
Several big time growers do deleafing practices in the start of Flower...