As stated before, the change in Sabia ASSets were done out of request/favour to the writer who is into bimbos and some other patreon in the server who likes bimbos too.
I'd say that they should write some fan fiction if they like this fetish, but they already do. The bonus scenes are literally this: non-canon short stories where the characters can act out different fantasies. The original Sabia is as far away from being a bimbo as she is from being a nun with Neve.
I feel like i'll write a long rant about this eventually, but some kinks have to be handled properly. They can't just drop the IQ of a smart woman into the negatives and change the appearance of a warrior to a cheap plastic toy mid game without explanation or set up and expect things to go well.
If Monsinne and some of their patrons were into isekai stories, then in the next patch Sabia would wake up in her VR headset and realize that everything so far was her sister's plan to steal her lvl70 raid gear at the beginning and she would spend her day in college thinking about how to get it back because her guild will have a siege next weekend?
Any writer who is worth having in a creative team knows better than this. It's that simple.