It’s certainly not a disadvantage to get to know your GC. And at some schools, it’s probably both possible and helpful. For our school though, to get the checkmark it’s not subjective. It requires completing the IB diploma. And if you are doing the IB diploma, there are only a few course decisions to make. So not much refining to do with respect to courses.
My D actually did get to know her GC somewhat well, but she moved to another job fall of D’s senior year, so a brand new CG who had only met her once filled out the forms.