The guy who made "Almost Naked Animals" got two more shows after this and is on his way to getting a fourth one. You want to tell me he's a comedic genius because he has so many shows, that he must be? You want to convince me that, "It's popular, therefore it's GOOD!"?
Alex Hirsch hasn't done shit except make Gravity Falls, and he dropped the ball with that and wanted to quit after one season. His own incompetence caused the remainder of the series to gradually drop in quality. Pen Ward basically handed his show over to someone else after a second season and Bravest Warriors is just a clone of the same show with a different cast. JG Quintel's "Close Enough" looks like Regular Show but with humans instead of animals. Every single one of Justin Roiland's projects looks like a spin-off of Rick and Morty.
Riding the coattails of your previous success, wanting to give up, or repeating yourself several times is not the sign of a "truly talented person". It's people who got lucky, plain and simple. There is a gigantic gap between someone like Craig McCracken who can move forward, make something new, and continue to succeed no matter what the project and someone like Alex Hirsch who keeps reminding people, "Hey guys! Remember Gravity Falls? Do you want more Gravity Falls?".