Let's be honest for a moment, kimetsu is great because you know that no one is safe from an awfull death, it's not the first time, and it won't be the last.
Kimetsu has pushed the boundries of shonen yet again, killing Shinobu on battle will make fans sad but I consider it a great move on the story. And what a terrible death, being assimilated by an Upper Demon.
And I am way to hype for seeing Zenitsu fight again.
The next chapter will be released on time again...
The boss fight of this scale with this many characters couldn't happen without heroic deaths. Otherwise the author would have to turn bloodthirsty demons into some sport fencers or something)