If you're wondering why they don't react to the wishes of their fanbase, take a look at their earnings
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and notice it's been rising fairly steadily since its inception, not even counting its two other revenue streams.
The people paying them seem to like what they're doing. Their fan reactions that you speak of are largely positive.
Why change?
Now based off what I've seen of their behavior it seems like they've actively done everything in their power to push away people who would be willing to give them good faith criticism. Either by mocking or censoring critics. (They may have changed now, but the damage is more less already done) So, only the yes men are left or are willing to talk to them. Not only that but the community seems to largely be fractured and spread across 5 different forums (here, 4chan, official forum, discord, and steam) Go to the official forums, steam reviews, and discord and it'll seem like Kiyoko is the most popular character. Ask the 10 or so people who regularly comment here and 4chan Brienne is the most popular. (I would have to go digging, but I remember someone posting that Brienne was voted most popular on 4chan polls with Kiyoko coming in second. Which further validates that Kiyoko and Tobs content popularity) Go to Steams forums and it seems Ethryn is the most popular. Or you can listen to the 10 dollars polls (when most patrons on Savins Patreon are only paying 4.90, I find it highly unlikely Bubs is getting regular 10 dollar patron. So, even in paid polls its not clear how the majority feel about this content.)
Now even if what I'm implying is true, one cannot ignore the patreon. Its holding strong and there making more money than most people on patreon. 125th on all of Patreon and 11th in their particular genre. No denying the series is successful. So,
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Well, there have been multiple projects that have made money left and right. Star Wars the Last Jedi, Skyrim, Twilight series and even 50 Shades of grey. No denying these series made a lot of money and are finical success. And if its only about getting money then they should absolutely keep doing what they are doing.
But if they want do something more. Something that has value beyond a dollar sign. I think they should seek out criticism and be willing lesson to people. Now don't take this as me saying they should self sabotage. Nor do think the project should become content-by-committee. Far to often in the effort appease everyone games will include content with no real purpose other than its popular or to scrape up some minority fan-base, which ironically leads to it appealing to no one and the game being bloated. I don't want that (the game is already bloated enough with all the one off characters imo) But, part of being an artist/entertainer requires that one have some ability to be introspective. It requires one to be able to sincerely consider both praise and criticism without letting their ego get in the way. This especially important to project leads. But this is what I would say to someone who is trying to create something that isn't just about the money. If it just about the money for them I'd tell them should abandon fetish porn games. They should consider working/investing in Star Wars, Marvel, Fortnite or Call of Duty, become a fucking V-tuber with big ol anime titties because that's where the real money is at. There are alterntive careers they can choose that are far eaiser and offer a bigger payday.
But hey what do I know. The only time I've seen $30,000 dollar was when it came time to pay off my student tuition, and I'm regularly wrong. So, fuck my opinion, right?