You can’t be an ‘ATG’ if you’re blocked and have achieved little, right? It’s a contradiction in terms.
I don’t believe in goats and I think the Big 3 era clearly illustrates why. There are different opportunities, merely. And the Big 3 era clearly illustrates this too. It’s been argued to death, and yet there’s a more interesting question at hand here: why are modern sports fans so obsessed with goats. There’s a reason why, I wonder what other people think that is…
My sense is that it goes to the heart of (Western) ideology: be the best, rise to the top, etc etc. Stuff that mostly originated in the "Age of Enlightenment," and more so with the Freudian superego, capitalism and the "Cult of Me." Even the self-help world is infected with this ideology: Be the best version of yourself as you possibly can, YOLO, etc...seemingly benign encouragements, but which puts enormous pressure on all of us, because we all inevitably fail.
There's also a personal psychological component: We live vicariously through our favorites, so if My Guy isn't the best, what does that say about me?
As you know, I take a "two truths" view. One is in agreement with you (and Moxie) and the other is playing the game of career accomplishments and singular GOATdom. So the answer, for me, is "No one, but kinda Novak." Taking the latter view doesn't mean that I don't think other players were equally brilliant and gifted - certainly Rafa, Roger, Borg, McEnroe, Laver, Gonzales, maybe others, played tennis on the "ultra-sublime" level, within which there are no real rankings, just sublime tennis of different variations. Calling Novak the GOAT is just recognizing that, when all is said and done, he has the best career resume, at least post-Laver.