Ammy is falling out of the meta in the sense that someone with the ideal fire team already wont run her any more and there are better options coming out in the next few months.Oh? Would you care to explain how so?
I still haven't seen the debuff immune content that the debuff doomsayers have been warning us about, so Amaterasu seems perfectly fine by me. At least, for now.
Considering that i dont think its reasonable to recommend Amaterasu for MTing at this stage.
I understand how ele/char attack works but Ele atk> Char atk eidos is still the general rule to follow , the situation you described doesnt change that.This... isn't true. Character Atk and Elemental Atk are equally powerful, but you want more of the one you have less of. And if you're running with a Friend P2W Eidolons (which you will against any content that matters), an offensive Soul weapon (which you should) and elemental advantage (which you might), then Character > Elemental.