People were obsessed with the idea that Aqua's death made this ship the only one possible (to such an extent that any illustrations with two, even just next to each other, were marked with the name of the ship), because you apparently had to connect all the characters to each other in one way or another. Plus the very fact of the announcement of the LN about the two of them (reminiscent of the story with the LN about the girls of the FF7 remake). In the end, LN simply developed and closed the subplot of their rivalry, further showing how Kana became a successful actress without a personal life, while Akane turns into a new protagonist and essentially spends all her time exploring and looking for opportunities to bring Aqua back.
It seems Aka simultaneously wanted to appease fans by dumping a mountain of gifts on a favorite character and teasing a possible sequel for another, but judging by the extra, this will either remain an open end or was completely closed somewhere behind the scenes. Aka just can't help but disappoint.
There is a fan theory that this is what they originally wanted, but after the publisher turned it down, they were forced to quickly scrap the whole thing and end it due to loss of interest and not meeting their expectations. At least Mengo herself seriously or semi-seriously stated her desire for such an ending, even going so far as to intend to write douji about it.