Since I see this is getting debated, I feel I should weigh in on this. Much of the theorizing comes from Last and First Idol, for reference. Good book, FYI.
Anyway, the appeal of Kimetsu lies in the mainstream acceptance of Otaku culture and the desire from authors born of that culture to actively violate "accepted" ideas in favor of creating works which actively exist both on their inspirations and as themselves. Kimetsu follows much of the mainstream ideals of battle manga as a genre in terms of structure and central appeal, but it derives much through having a protagonist who doesn't follow the Goku model, and is equal parts light-hearted and exceptionally brutal, with many extremely dark backstories and characters directly suffering from permanent injury and death.
Essentially, the series actively survives not on creating its own tropes per say, but by using the active framework provided by authors like Toriyama, Togashi, Watsuki, Oda, Kishimoto, Kubo and others to create a work which is viewed by the subject audience as appealing and well-written. It is a display of how Jump proceeds in the 2010s, through works which garner mass appeal through strength of writing and long term discussion, rather than instantly striking on part of its artwork.
That's my view, anyway.
