Wait, they criticized Tanjirou with what amounts to "arbitrary skepticism that he should be able to do these things" We also don't know how strong his newly transformed and starving sister should have been on top of her own resistance. The Giyu thing was to show Tanjirou was resourceful (not that Giyu was trying, though he shouldn't be threatened by a thrown axe to be fair either) and put Tanjirou in a position to show Giyu that maybe he was the monster here, not Nezuko. The rest of it was basically arbitrary skepticism. Shit, I love Yu Yu Hakusho, but if they want to piss and moan about unearned power ups, Yusuke's second rebirth randomly awakening his ancestral DNA is a bigger stretch with no previous narrative allusion to it in the manga. Anime kind of fixed it with his aura being a demon phoenix in the DT vs Toguro. Huh, that's more shit Ichigo kind of loosely cribbed from him :hm