Kurt Cobain had a knack for a catchy tune, but he didn't have the intestinal fortitude to comfortably accept commercial success. He likened writing hits to some sort of existential compromise.
Yet, he liked pop music, from the Beatles to Queen.
Nirvana didn't make many albums.
Three official studio albums, a b-sides collection and a couple of live things was all they made, so a "Greatest Hits" doesn't need to cover much ground.
This makes a nice Cliff's Notes version of the band and makes an entire boxed set seem a little silly.