@Angelo Gabrini
I have seen your comments complaining about the length of the volumes, such as volume 14, which has more than 600 pages, and about the fact that Ais has been very secondary in the main series, so I wanted to point out that if Ais and the Loki family had been given a lot of development in MS, the novels could have been over 1000 pages. This case reminds me of "Game of Thrones", that work also has a lot of characters and as the author does develop them all in the same work, each novel has more than a thousand pages (letter size).
Yes, it is possible to only develop the characters that will be most relevant to the volume in question and leave the rest aside, however, that would generate unavoidable delays in the development of characters that, although they are not essential for the volume, are essential for the series, like Ais for example, left in the secondary role during the whole main series because she couldn't be very relevant until now, so your idea hasn't worked as well as expected, that's why I think that managing the narrative from two parallel novels focused on different perspectives is the best solution. Imagine, for example, if in addition to Ais, Lefiya had also been very important and well-developed in the MS, then the number of pages would necessarily have to be significantly increased or start discarding the characters that until now have been protagonists in MS, too many relevant characters!
On the complaints of the volume 17:
Danmachi is a shonen essentially, however this arc has been quite dramatic, I personally don't mind because I like romance, but for pure shonen fans who follow this series, they shouldn't be very happy with so much romantic drama, That's why I think it would have been good to have at least part of the development of the fights spelled out, and I'm not the only one who thinks so, that scene of Hogni fighting with Ais, Tiona and Tione has given rise to endless debates on this wiki.
But regardless of the theme of the volume, that the author of a work is cutting scenes of interest seems to me a bad practice, that's why I said that it's okay if he did it because he is going to develop the facts in another work but if it is not like that, it means that he loves suspense and I hate it, this series is not suspenseful! But as you said, it's something subjective, there will be fans who like the author not to develop the facts and leave them in suspense, but not me.
Regarding knowing Ais's feelings in each event, yes, it is true that it is not necessary in all cases but in this particular case it is, because a conflict has arisen over who will stay with Bell as a man and it is of great interest for the work to know exactly Ais's feelings about it, remember that the romance between Bell and Ais is one of the central axes of the series (Liaris Freese!), and also I sincerely hope that at the end of this arc Ais and Bell's relationship progress significantly, even if they do not become boyfriends at the end of this one, at least that the commitment between them is formalized, and for this purpose it is essential to know Ais's feelings, and usually these have been addressed in Sword Oratoria, not in MS, I also remember that you have complained about the lack of development between the two then...!