I'll never understand people like you.The biggest reason these "all girls won't be available in a single save file" games, whatever tags you want to put or remove on that is irrelevant, are bad because it's always so massively impractical. I'm supposed to juggle multiple save files and replay all of the content that is going to be the same in all the routes over and over and over? What, do you REALLY think my only hobby in life is to play *your* AVN? You're making your porn game so time consuming that it doesn't matter if the writing and renders were sculpted by the will of god, I just won't have time for it.
And why, too? What do you possibly gain by making the game overly long-winded to play? It's not like you earn more money the more time someone wastes on the game. Having an all-girls-available route would only require relatively minor changes to the code and writing, all the scenes are already there. And so the people who only want one/some girls are still happy and those who want a true harem are happy. Not including this route doesn't improve the game in any way. It just doesn't make sense to me at all whatsoever.
If you don't like the game, move on instead of ranting about how the game should be remade to suit your tastes.