Serious Question: Do you want Death Battle to be Rebranded to get rid of the ONE MUST DIE rule?
Fights like Mob/Shigeo vs Tatsumaki feel incredibly weird like this. Goku vs Superman lead to the Earth being destroyed which neither Goku or Superman would want. All Might vs Might Guy starts out incredibly friendly and funny. Then they try to kill each other. Villain vs Hero, Anti Hero vs Hero or Villain, and Villain vs Villain make sense with this, but two good guys like Sora and Pit trying to kill each other feels wrong. Even in the case of Hero vs Villain, you have characters like Batman or Spider-Man who go out of their way to save villains at their own detriment.