For me, Nole doesn't need the slam count to be GOAT. I can accept that the slam count is the simplest and broadest GOAT definition available and this is a minority opinion. Of course he needs a bit more but if he aims for the slam count, he could pick up a few more records that Roger simply couldn't manage, eg RG, CYGS, another Nole Slam etc. If he equals Nadal in slam count at 17 and Roger stays at 20, Nole might have achieved enough to satisfy me. I doubt it will play out that way but if so, I would have to give credit where it's due.
Sure Roger had multiple eras, court speeds and racquet technologies to contend with and has probably the most stylistic and statistical claims to GOAT, but he just could not put other ATGs down and establish himself as first among equals on the biggest stages. That is hard to overcome when considering the history of what is a non-contact version of combat sport.
I am a massive Roger fan and will teach my children to play like Roger. I was taught to play like Edberg and Mac, but it doesn't mean I can't acknowledge the superiority of Lendl and Borg.