The data shows that lots of people play Standard, especially on MTG Arena, so it comes around to one of the more common answers for too many questions, money: It costs too much to play Standard in paper
I'm not going to claim that formats before Black and White were universally better, because I don't think that's true, and I didn't play them so I can't really argue either way
Ravnica was light on the novelty of new mechanics
Previously, Magics Universes Beyond crossovers have taken place in Middle-earth with The Lord of the Rings: Tales of Middle-earth, the martial arts-filled world of Street Fighter, and even the undead nightmare of The Walking Dead
Wolverine also has Regeneration, which removes him from the battlefield when he would usually be destroyed
Let me know in the comments below, or over in the Draftsim Discord