It's also industry standard to have a white character for the PC. It's also industry standard to have characters who are all there for the player to bang. To go against those norms is not regressive, or progressive, it's just different. How it is percieved in the end I don't know, neither do you.
A character who is player sexual is a character who is lacking depth in a very important part of their existence. A character can be bisexual, but having them swap back and forth to fit the player makes any romance with them feel trite in my opinion. For instance, Nikka was always bisexual, and was always available, however that was a conscious choice by me to inform aspects of her character. There's also Kani, who was always going to be bi-sexual, however her initial discomfort with being with a man, after her past, gives her just a tiny bit more depth than just having her completely open and available. Case in point, your next comment:
Which means they were not player sexual at the start if I read that right. They change in the plot for their own reasons (or in some cases through blackmail/extortion/etc.), that's character growth to a degree. I am not opposed to changing a character if players ask for it and if it makes sense for the character.
I said Ashe was going to change from Heterosexual to Bisexual due to a lot of demand and pressure from the audience, but in the case of that specific character, she has strong cultural taboos that heavily influence the 'norm'. Her identifying as heterosexual but being more bi-seuxal under the surface is not something conclusively precluded in the game yet. Breaking those taboos are much more interesting and a simpler prospect than suddenly having Samantha fancy a guy when she has always had that option and has never taken it. If it doesn't make sense for the character, it doesn't make sense, and changing that on a whim, with no rationalization at all on behalf of the character, is not good writing.
I'm sorry that this game is not meetings your expectations, but it does meet the expectations of others. There is more than one audience type out there, and for me to claim that I can please everyone is to lie. My next game will likely be different, but I do not know what shape that may take yet. We'll have to see. I welcome opinions on it when the time comes, just as I do welcome hearing opinions on Starship Inanna now. Thank you for sharing yours, even if we do happen to disagree on this.