Games should offer more than that and something else, not just scenes but a way of interaction and stimulation which galery or scene play wont achieve.
Well, most games offer more than that, a story. This thing that link the scenes together and create a whole from all those separate pieces. And, by the way, there's nothing else that a game can offer that wouldn't be in a replay feature ; it's kind of the meaning of "replay", to play again a scene
like it is in the game.
Like randomization, simulation and more interactivity.
When they do, people complain, not necessarily without reason. If you want a full game behind your lewd, play a modded Fallout or The Elder Scroll, but mostly peoples play games available here because they don't feel, at this moment, to play a more challenging or "gaming" game.
And, again by the way, one of the most liked feature of my two main mods is... that they remove the randomization. Randomization in adult games are generally annoying. Whatever if you play for the lewd or for the story, in both case it force you to repeat, again and again, the same part of the game until you're finally lucky and have what you want (the lewd, or the story that finally advance).
A more responsive world and/or an ai of sorts that would react to you.
Well, put US$ 500,000 on the table, for the developer salary, and you'll get a game like this. If games on the scene tend to stay, relatively speaking, basic, it's not just because they are made by amateurs. It's also because the budget isn't at all the same than for an AAA studio.
It's not impossible to have such game, but it would need way more time, and so money, than what is generally possible on the scene. There's among the devs on the scene some that could do this kind of game. But, and I understand them, they don't want to pass years totally working for free, especially since they don't have the guaranty that it would pay off in the end.
The most you can get on the scene is basic adaptation, like in
Super Powered by example, that's all. And, globally speaking, that's also all the community expect. Not that we wouldn't like more, but we know that there's things that can't be done, even by the few professional studio on the scene.