That's pretty thorough, thanks. I wish you could have a more neutral path, that is, not really being a dick to your LIs but perhaps neglecting to give them as much attention as they want? Which is easy if the game allows you to pursue multiple LIs, right? Relationships rolling more or less like: you're attempting to woo every girl in the game, but simply can't be everywhere at any time and you end up being NTR'd. If this is sort of what the game lets you do, I wouldn't say its NTR is all punishment. And since you mention that the game doesn't have an ending (and hopefully never will?) would it be possible to still fuck the LIs that cheat on you, by managing relationship levels if needed? And whether Matt banging sister, and other NTR arcs that there may be, can be reversed/exited later on, if you start giving your LIs what they want/deserve.
In many ways, I absolutely agree with the desire to have a game with that level of nuanced relationship possibilities, but from a development standpoint, that would be an absolute nightmare to attempt. Put (very) simply, every time a choice was made (or not made), two new story paths would have to branch off, including two sets of unique scene renders (with some crossover, of course), and then if a certain choice is only available on one of those paths, two new sets of everything would need to be done
there, ad nauseum, until the story paths merged back together, but the variables would still need to be tracked and interactions and choice possibilities would constantly need to be checked throughout the primary storyline.
It's kind of a two-sided coin. On the one hand, sandbox games are awesome for the players, because it gives them agency in how the story is told, which lends to immersion where we become
part of the story instead of just having it told to us. On the other hand, every choice the developer decides to put into the hands of the player has the chance of geometrically increasing the complexity of what needs to go into the game.
As an aside, I just say that I hope AFV never has an ending, because it is, in my personal opinion, one of the best sandbox AVNs out there and I would love to see it grow and expand for years to come, because there is still so much untapped story potential just waiting to find its sexy time in the sun