There are choice, but not many. There will be more in the future, but it will never be a choice heavy VN. But it's false that there are no choice before the lesbian "switch", you have at least the one about Naesala.
As for rejecting girls, not really. Some will, but more the one night stands.
The thing is, I intend to show the women during their pregnancy. If I let the choice of who you have in the harem, that would mean a lot more renders.
Imagine a scene with 20 renders, and 3 women. If I let the choice of who the MC has in the harem, that would mean that I would have to render 160 renders for that scene alone. On the whole VN, it would mean thousands additional renders. Perhaps dozen of thousands.
I chose to make nearly all the girls unavoidable for that reason. I could do it, but then the VN would take ages to renders.
That's why most devs show pregnancy at the end of the story. But since I want a lot of pregnant sex...