I was bald(or almost) for quite some time in my life, i only switch back and forth, sometimes i let my hair grow to my shoulder, then i clip everything, then i let them grow again... I have a clipper at home so its not really complicated for me, sometimes i just feel like an haircut and visit a "coiffeuse friend" (hair dresser i think in english?)
But my main problem is my hair get greasy very quick, i need to wash my hair everyday... I can sometimes let pass a day if im not going outside or anything, or in winter if i just have to go to the store quick i put a tuque, but if im going anywhere where i need to remove my hat/cap/tuque, i need to wash them. So its a lot of work when i get them long and at some points it annoy me, so i cut them...
Cause as a metalhead if i could wash them once every week like some people, i would let them grow very long...