One thing to consider is that Yuuna was number 1 both popularity polls tho of course that only represented Japan's viewers. If he only went by their input, then the majority of Japanese readers will probably be happy with the ending.
In one way he did sorta go a similar route like Bokutachi wa Benkyou ga Dekinai with the alternate girl endings, the difference being Yuragi's was incorporated into the main storyline instead of being treated as a separate ending altogether. As fans of the other girls, that may be the best we can hope for, unless he has something else planned for the final volume's chapters.