I can't fathom folks showing up to a new work from one of vanishingly few mangaka (or published authors in general) repping committed aro/ace relationships to say "gosh, I hope this one is more like everything else I read!"
I understand what you're saying and why, and in no way am I trying to dismiss or belittle your point, but I'd like to offer a perspective on this. To me, one of the reasons Usui Shio's works have not been "like everything else I read", is a lot about the way they present the story, the way they construct and develop the characters and the plotline and the depth in them, and other nuances in their style and writing, and I really want to see these qualities that I adored in both "Donuts" and in "Marriage" (this is a terrible shortening lol) in a more, for lack of a better term, "traditional" romance story. In other words, I'll share that the reason Donuts, in particular, resonated so deeply with me wasn't the (a)romantic aspect of it, if that makes any sense lol. Like, different people are looking for different things, and there's nothing wrong with that.
As another example, I feel similarly about Fukaumi Kon - "Haru and Midori" is one of my favorite manga of all time, and a large part of it was the author's character-building and the atmosphere/vibe/pacing. Seeing those aspects that I really, really like in their writing play out in "A Love Yet to Bloom" which has a wholly different flavor has been an absolute joy.
Also, I saw a few comments that mentioned it'd be boring or disappointing if despite everything, Asako "overcomes" her being ace, and again I understand what they mean, but to me, it isn't "overcoming", since Asako, in particular, is genuinely going through a pretty serious introspective process, which would be the shaping of her character, and regardless of what she realizes she is at the end of it, so long as the execution is good enough, and I have a lot of trust in the author, it'll feel appropriate. I really do hope whoever reads this gets what I'm saying here lol.
In any case, about chapter 5 itself, I really like how things are going. I find that the questions Asako asks herself are genuinely interesting and really important and I'm looking forward to seeing her making sense of her own world. Also big fan of the two's dynamic, it feels a lot more fluid and organic than in many other stories I've read. I hope that Asako has a chance to talk to her sister at some point if nothing else because it's kinda weird to me that she'd cut her off just because she "ran away" with someone.
I totally agree with this. Portraying characters as functionally ace isn't actually remotely rare, even beyond all the G rated Yuri out there, there's a lot of stories about women written by people who have a mindset that either women are inherently functionally asexual, or that there's something fundamentally wrong or exploitative or uncomfortable depicting women as being sexual (I still judge the author of She Loves to Cook and She Loves to Eat knowing their previous work before that chaste as hell manga was an extremely horny BL. That BL was good imo but the gender gap is just so ridiculously stereotypical). You can search "pure yuri" and find an endless trove of functionally ace yuri manga.
The thing that made Doughnuts special for me is that the asexuality was actually named, making it a very deliberate exploration of that rather than an implicit or embarrassed or accidental portrayal. That manga has a care and delicacy in portraying the character's feelings as an actual identity rather than just the circumstances, and THAT is rare and special imo. This is why I'm also liking "Our Love is Disgusting" by the same author. It's not about What they're portraying that makes them special imo, it's the How.
(PS the author of She Loves to Cook and She Loves to Eat declared the characters to be demi on twitter this year iirc, but that kinda feels like a 'dumbledore was gay' moment to me given that they said it so late and in a place so abstracted from the actual text of the manga. Especially since there's an explicitly asexual lesbian character in the manga already serving as a queer senpai to the MCs and so there's no excuse for this demi identity to not be in the text itself)