The problem of all those games is the sex reward system. Grind -> one scene -> grind -> one scene -> repeat. It's boring and blueballing. Dev start of development of a new game - waith a month, here is hj scene, wait another month, here is tf scene, wait another month, here is bj, month, rub ass, month, missionary, month, doggy, month, anal, month, threesome, month, pregnancy. Too slow, too boring, but patreons scream - take our money, work faster! No, dev said, because work-illness-artists etc bullshit. In real world you can make a framework of animated sex mechanics once and then you can make a million of sex variations. Just look at japaneese devs and live2d content. No slow milking, just fair work for their japaneese enjoyers with sex in core game mechanics, not just oneshot rewards.