Do I have to take Finasteride/Minoxidil post-FUE to see real results???

[Forelock]

Hi all -- recently paid a deposit for a HT with Dr. Rahal next month. Still deciding whether I want to take the leap, as I've been seeing some variability here in terms of results/outcomes. I was just wondering:

I've not been taking any medication to slow the recession and I wasn't planning on taking any post-surgery. I understand that native hair will continue to recede at a normal rate if I don't take finasteride/monoxidil/rogaine, etc, but will this also reduce the likelihood that the grafts will take? Should I expect less growth, or will they just take longer to sprout? I don't mind waiting, but I'm not sure I want to move forward if this will drastically affect the outcome.