I know right! And something I just realized too Since nezuko can walk in the sun, she cannot be killed. The nirichin blades are made from a jewel that stores the sun's energy which is why it is able to kill demons. They don't realize how lucky they are to have someone as powerful as her on their side
Yushiro: *calls nezuko ugly* Some hashira, tanjiro, zenitzu, me and a part of the fandom: UGLY?! HOW DARE YOU?! Tamayo your assistant need some glasses-