Because either you forgot that more than half the manga is pointless bullshit, or your "Top 3" needs better entries.
I don't agree with your assessment of this manga's contents, but I outright can't make sense out of the imperative "you need to like better manga!"
No, I don't.
My hierarchy is largely based on specific personal attachments-- does it have things I like, and does it make sure to use those things well? Do I resonate with its themes? Is this manga a core memory for me? Do I deeply respect this mangaka?
"Story quality" is also important, but I'd still value the earnest fingerpainting my child made in kindergarten substantially more than the
Mona Lisa-- talk less of a competent work that stuck with me versus
other competent works that may not have (even if they're arguably
more competent).
Are there better manga than the ones I like? Even if I grant that assertion-- and I grant it verbatim-- it's not relevant to specifically this matter. Why would it be?
I knew it was an "it was all a dream" filler chapter, the moment I saw nazuna in the school as a student. Hate it. Couldn't they just have not made this chapter, if it was all just going to be non-canon stuff that has absolutely no relevance to the plot (and instantly forgotten by chars), anyway?
How is it "filler"? It's clearly a peek into Nazuna's desire and insecurity, which also contextualizes her reversing her sleep schedule.