The sharing route seems to offer the most opportunity for drama.
Again D only is getting stale because the VN has completed that story.
If D and F marry at the end of Chapter 3 there is little plot development for that path in Chapter 4.
Yup! And that's really the thing: sharing path is the only path left with any real story or plot.
That's not pro or anti-sharing. I'm gonna pass D around like a blunt but that's not the point, it's the fact.
Non-sharing is just more fucking her and maybe other women mixed in. Ok. At most the drama can come in fending off other dudes but you'd already know that you can't lose so what's the point?
I contend that if strictly a D&F guy, the story is effectively over. There are no more conquests or developments that haven't already happened in one way nor another. The only thing left is the corruption/sharing of D.
Now I'd hope they went really strong in that direction for the sake of story. Let D branch out and stop being this infantile little baby. Let her think she's grown only to run into men that are being alluded to but never fulfilled - scumbags that prey on naivety. Essentially, let the player take over as D in a series of life choices.
In fact, another game does exactly this and it's great on a fraction of the budget. I think it's called Sugar Daddy or something and the D character is in it. For me? Once D&F became boring to me, that title has been more fun to play.
Why? It adds new shit and consequences. Ya know, like a story should have.