Here is my piece about it. Not comparing it to Arioto though. I don't think the comparaison is that interesting, but I do enjoy talking about the novel though.
I started reading the light novel when volume 1 was released in Japan, like a year and half ago and I was really into it (I even talked about it in a thread a year ago). Then, when I finally catched up with the web novel, I really started to lose interest in it. Still do read the weekly release though.
I don't mind the slow burn but here I feel like it's dragged out to the point of stupidity. The relationship is also a bit too unbalanced for my taste, and I started to pity Sendai a while ago, as she has to bottle up her feelings constantly. Miyagi is only conceding the smallest amount of thing just to keep their relationship afloat, to the point where it's becoming ridiculous. Is it kind of toxic in a way. When she finally admitted that they weren't just roommate, it was just to have the stupidest advancement in a relationship ever...
The thing is I understand that she has to come out of her shell and process/address her abandonnement issues. But they never talk about it, and it doesn't even seem the author is planning on having Miyagi process that one way or another. Not really surprising knowing how therapy is almost non existent in Japan, but it's really frustrating. I wish they were also communicating on a deeper level. Most of their interactions are very limited, it's a lot of guessing and stuff not being said, but it's part of the issue Miyagi is having. But after years of knowing each other, I'd wish to see more advancement on that part.
The sexy scenes are well written and I do enjoy (re)reading them, but are so spaced in time that is looks like they aren't at all on the same libido level at all. Not that I want to have more sexy scenes written up, I just would like to see them on the same level. Sendai is always waiting for Miyagi to catch up. She honestly deserves for Miyagi to better herself.
I'm complaining a lot, but I used to be really into it. My reading speed in Japanese is pretty slow and it took me about 7/8 months to catch up on the WN and I felt like my life was really rhythmed by those two characters, it was really enjoyable. I started to lose interest after seeing very little progress, which become even more apparent when I catched up with the WB and started reading the weekly release.
While before I really enjoyed seeing the character evolving and understanding their motivation and each other, now I feel like I'm seeing the author writing the character more than I can feel the characters being real (at least, since around chapter 200). I see them dragging the narrative more than necessary. The reason I feel that way, is because at the beginning, maybe up to around chapter 200, their progression was organic and felt natural. Not it feels like it's being slow down just to drag the slow burn.
I know that with the last chapters we are waiting for Miyagi to do something soon, but depending on what/how it happens, I'll probably stop reading the WN for a while. Maybe reading multiple chapters at the same time will help to feel a better sense of progression.