I absolutely agree that this is only part of her appeal but you have to agree that "forcing her" onto the MC gave her the chance to get way more of her story out compared to other LIs. I mean you have to hang out with her multiple times even if you aren't on her path whatsoever. It's very different for the others.
Zara and Sasha keep growing on the players but I think Zara had her personality altered a bit. She was always the more agreeable of the two sisters but I remember her being a lot more standoffish than she is in CH 4.5/5.
Sasha was always a fan favourite, or a favourite of many at least, even back when she hadn't said a single word and was just in the background staring into Nikas soul.
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I do agree that out of all the LIs, so far she's played the most important role in the main story, which has given her most of the screentime. But my point was that her character archetype is the most popular and attractive out of any LI and even if we switch the amount of screentime she got with characters like mila or vic, she would still be more popular than them. If we switched it with Zara or Sasha, now that would be interesting, as they somewhat fall into the same trope of ,,from hating to loving."
As for Zara, I don't think she had her personality altered. It's just that Nika has gotten to know her better and she now has some respect and affection for him and is acting much more free and comfortable around him.