The problem is that - as far as I understand - that's strongly tied to a custom character's personal quest AND "the dark side". So if your character isn't easily seduced by a pretty face, you lose a huge(?) chunk of story. A story that isn't necessarily a romance subplot. If it was just a customizable romance option and rejecting it would only lock you out of the romance, fine, whatever, I don't care (just give me the option to not make the dream waifu at the beginning). But the way it's implemented now appears to conflate "seductability" with leaning towards abusing tadpole powers.
This is annoying. I have plenty of characters that would be happy to use the tadpole but why does there have to be forced romantic interest attached to it? I could maybe see one of my characters having a quick tumble with barmaids on occasion but romance? He would run like hell. The rest have more important things to worry about.
I wonder if a better example to use for people would be if they forced a straight dream person on a gay player or vice versa? There would be complaining for sure. Especially if it locked you out of content. Only thing with this example is that there would be offended and traumatized people, of which I am neither. It is just that the majority of the world can understand and feel romance, hard to explain anything from the other side.