The only thing that I can think of is that if Elem Res- debuff really does help debuffs land, then it's really good news for Thor. Like in Sloth rankings screenshot that I saw, all the teams had Thor and SSR Baal. Is that really the solo reason why people think she's good? "Hey, I saw this Hime on the rankings boards, she must be great!"
... yes... she has a niche of being Thor's buff-bitch. That's... great? I wish people would make actual arguments for SSR Baal. Such as, replacing Mammon due to her downsides in the far future. There, I got you started, why don't you finish that line of thought?