That's not the reason. The reason is that he can't seem to ignore those people and write the game HE wants. He seems to want to try to make EVERYBODY happy, which is actually just making everybody unhappy.
Absolutely no one is making DS change anything. He voluntarily changes stuff because if he doesn't he loses patrons, and it's no secret his income from Patreon is nowhere near what it used to be. He could certainly make the game he wants, and was probably the closest to doing it with Glamour. The problem is that what he wants and his patrons want don't seem to align all that well. Or rather, they're aligning too well now because people that didn't like Glamour and where it was heading all left. So DS made another decision that he's going to change things to try to make a game that will attract more patrons. I'm not a developer, but if I was I would probably start by trying to make the game I want. But if the money led me elsewhere, I'd probably follow it there, especially if the difference was big, and even if it led me into stuff that wasn't within my interests of even squicked me out.
I've heard that the game won't have incest in it, although I sincerely hope that there is a patch for it or something. I could see DS refusing to do it himself though. He might think adding the characters back in would be enough without explicitly making them family. For me, the entire fun of the incest kink is when the relationship is especially mentioned, and especially the taboo-ness of it.