I definately agree with this. I don't think it makes sense to have a scar for such a small amount of grafts. I would say, if you are adamant about proceeding now, that you should put some time in doing more research about your FUE options with different doctors so that you can acheive the small number that you need now but without getting the scar.
Otherwise, if you're set on FUT, I would definately wait until your pattern evens out and need more grafts which which maybe justify being left with the scar. Just imagine the worst case scenario that you go ahead now and then continue to lose hair into your 20s and 30s and need a second op, you'll end up with 2 scars. I know scars are not as bad as they used to be but it's still something to consider especially if you have thin hair or like to wear it short.