This alternate story turned out to be very cute, and changing the setting so that Kaguya is a child was a clever move in order to remove her as a potential love interest in the safest way. The fact that in the end she even acted as Hayasaca's wingman should in part compensate for for all the harassement she has to bear in the main series.
I wonder if we'll get another what if arc with Fujiwara or the author's intent was specifically to please Hayasaca's fanbase.