Why cant you buzz cut your hair carefully after a FUE hair transplant?

ive been told i cant buzz or trim my hair for up to 3 months post fue, wondering what the reason is, obviously the grafts are implanted firmly after two weeks, and around a month they will fall out so i will be left with stray and wispy hairs over my head which would be a bit of an eye sore! donor area plan to buzz after it heals prob at one month, but i mean would it damage the grafts if done with a quality clipper and a close guard, or even individually buzzing the follicles short. thanks