That's really the issue with games like that. When you have multiple characters, every character will be *somebody's* favorite. So every time you release an update, and in that update not every character gets some new content, somebody will be disappointed. There are only three potential ways to make your audience happy in this situation:Yeah I'm one of those people, from the household I kinda like the skinny girls (the homeless one and the skinny one with normal human tits) but Velle, Esther, Nefari, they don't really do anything for me, I don't progress their stories either unless it's necessary.
I like Paige from the gym and that larger woman with the grey hair (sorry I'm shit with names - I tried to look up the names on the official website but that's hopelessly out of date, apparently). Also the horny older Japanese hostess was a huge turn on for me somehow. Then there's the elf girl and the two tanning girls at the beach. I hope all these characters will get content sooner than any of the main girls to be honest.
Having said that I completely understand why people prefer more focus (i.e. content) for fewer characters. There's also a bunch of girls that just got an introduction and that's it. More games suffer from this 'feature creep' (I'm sure there's a porn-game-equivalent for that word lol), Lucky Paradox springs to mind.
1) Keep the character roster small and therefore manageable, which makes it less likely for too many people to be disappointed at once (MM already failed at that, with the amount of side-girls);
2) Make sure that every update has something for every character (again, falied);
3) Make updates small, but frequent, so that people don't even start questioning if the game is abandoned (failed yet again);
And before anybody starts that discussion again (particularly with point 3) - it's possible to work on big events in the background, while still releasing small updates along the way.