Maybe but have you tried the others? like Astaroth may have big damage but that's it. all the S tier also has big damage and they can also heal consistently or farm some other bullshit that completely denies them of a lose condition.

What I did to make that chart was I went in to floor 75 of Tower with max level basic 5/5 R weapons and level 1 R supporters with no real effects and tested how their raw abilities actually match up in a sort of controlled scenario.

What I found out is that yeah Astaroth has big damage but so do many other characters and having no risk of dying and greater control over your character and how you play is more vauable than taking a few more seconds in a stage