Idk why the Demi-fiend would show up in that conversation, he swats both of them like annoying pests
I still don't understand how you can downplay The Demi-Fiend, let alone any SMT protagonist to perfectly frank.
SMTV explicitly starts and basically leads off the fact that most of the Demons we encounter? Are genuine GODS with all of their known feats available to them. In SMTIV: Apocalypse, you literally demonize YHWH and he ends up getting even STRONGER than he was beforehand despite being a Demon at that point.
The entire plot of SMTV is to literally put a new God on the Throne to make him a true Creator onpar with YHWH.
The entire plot of Nocturne is the fact that the Universe, the fucking Universe, was literally folded into a small ass Egg that's called the Conception with a fragment of YHWH in the center that in the canonical ending, The Demi-Fiend obliterates him from across the entire MULTIVERSE! Then kicked Lucifer's ass and is now a True Demon and he had to fight many Gods including Metatron himself.
Like unless these people never even looked at SMT, I don't know how you can even think it's "alot of saying, but no real feats". It really feels like people listened to IWD's Feats > Statements but they take it as the holy gospel and throw all sense and logic away from the fact that if a statement collaborates with the feat, it's accepted.