I have very fine hair and I do not use Fin or Minox, I got my transplant 1.5 years ago. I am pretty happy with my result, my frontal third was basically bald, only a small amount miniaturized hair left. Don't expect it to be super dense, because 50-60 grafts / cm² is the max to implant. The advantage ist, fine hair looks very natural, so the transplant ist hardly to detect. My surgeon said the same, for perfect density, you need a touch up. Touch ups a way less effort, because you only need a few grafts and no full shave.
I added a current picture of my hairline. The white dots are from a crappy hairspray I bought on vacation. Will never use that again 😬