...
In Old pre-rework WiaB, Miru is ...hideous. As in, hideous enough that most AVN players wanted fewer sex scenes because of her. Most wer happy old Miru was the focus of most of the NTR, even the NTR haters thought it was okay, because she was that hideous.
...okay I'm exaggerating. But she was bad. Katie was unique, and was so antagonistic an suspicious, but so loveable. I wanted to win her trust. Leia was just goth mommy vibes (despite not being a mommy) with a great scene right at the end before the rework, but Katie was the person you spent most of your time trying to romance. At least, that's my reasons.