What is so beloved about Rebels?

What I figured was just going to be an animated hors d’oeuvres to hold fans over until Disney got the sequel trilogy out is now viewed as some of the best Star Wars by fans both casual and committed. Imo, while there are great cartoons (I’m an adult fan of several), I wonder just how a cartoon on Disney XD got such a following, and how it’s legacy is now the flagship TV show under Lucas Film.

Fwiw, I enjoy Rebels just fine for what it is.