Regarding Fischer...
Of all the GREAT players, Fischer had the LEAST support - Casablanca may be the exception and Paul Morphy if you want to go way back. The Russians had an entire system and current players have computers. Fischer had himself in his little NY apartment. For that, he will always deserve to be considered one of the all time greats.
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As for Nepo vs Carlsen...
Nepo scored some EARLY(!) victories, he's playing really well, and he does have the man-bun, but don't expect a change of world champion in 2021. The tournament format favours Carlsen against everyone but Nakamura.
Of course, if Carlsen played Nakamura for the world championship, it would never get to the tie breaker. That's why Magnus will be on top for the considerable future.
Nakamura is great at what he’s great at, speed chess. He’s not close to being good enough for a classical world championship.
(and he doesn’t even care) haha sorry I couldn’t resist