Honestly I think it does make sense. Old Xian has been working on this for over a decade now. She's in her thirties now and you have to understand that the artist grows with their story. This is just my guess but I suppose that after ten years she started to identify - or at least became more interested - in Mos and He Tians relationship. I understand that on a professional level it doesn't really make much sense to turn the story and focus like she did but this comic has been published for free and Old Xian doesn't seem to have much restrictions. Therefore she does what she wants with it, even if it's hurting the story. Just my take on it. Author grew older and simultaneously grew out of Jians and Xixis relationship..?
Fr fr. Happy that He Tian and Mo stans get to see their couple, and maybe Old Xian prefers them and that's completely fair since she is the creator, but the first pairing will forever be in my heart!
I love a good slowburn angsty childhood friends to lovers and the first pairing hit all the boxes for me when I read this yeaaars ago

I seriously need a separate story for ONLY Zhanyi, like ITS A MUST!!! They're the reason why I started reading this and I can't get enough of them (then the author decided to set them aside like they were some fly's )