Because so many FF6 fanboys hate FF7 since 2010
They like Crisis Core because they hate FF7 that much, instead of it being SPOILERS "The great escape" plot where its heroic in effort of escape but gets shot, just like where the great escape took inspiration of people who tried to escape but got shot by nazis, thats heroic. Wanna know whats not heroic? overexaggutate a fight scene with state level propaganda entertainment (hurr look at me, i am Zack... i am a KH Clone in this game whoopedy doo). Thats stupid and lame. Zack got better in FF7 remake, same personality and voice as he was portrayed in FF7 ps1 game artwork and depiction of his personality (pissing off Crisis Core fanboys... good, good)
Now i will piss of FF6 fanboys. Only way to play FF6 is steam version, it has Clown battle UI, which fits the narrative of the game. Story sucks, but its playable and not so bad if you only go with PC version unmodded, everything else is bad however. This is the only true game
Outside that. Story sucks 1/10 game. Gameplay sucks unless if its PC, then its alright if you ignore the story.