Apart from gutting it and replacing it with a normal dialogue system, I can think of one viable solution to make this a game with a story people can care about. Have the VOICED dialogue be asynchronous with the text options you select. In other words, let our characters have their own personalities, dictated by the tag system, and let that uniqueness be displayed in how they express the options we select. So, if a "dialogue" options reads
*tell him you don't appreciate his behavior*
and you select it, have the red prince's spoken dialogue be significantly different from, say, Sebille's. Same selection choice for the player, but Sebille expresses it her own way, with a different line and delivery, compared to the red prince, since they have different personalities.
So one might say "That was uncalled for..." while the other says "disrespect me that way again and i'll show you your own entrails!"
Real dialogue. Which means real conversations, which means real humor and emotion can be conveyed. Also allows for a ton of replayability, since even the same options will feel different on different characters.
You have correctly identified the exact Big Issue with having specific dialogue. Many people have asked for specific lines. That might sound good, but for a game which has 10 origins, a single specific line would end up being so generic as to rob most of the personality from whichever origin you chose and making them just like a generic no-origin character.
However, while you have correctly identified the right way to do specific dialogue, you have completely failed to grasp that it would be tremendously burdensome to write the specific lines. It would be exponentially burdensome to pay voice actors to recite specific lines.
There are probably hundreds of these generic lines in just the alpha area. Even if we allow for the possibility that many of them could be shared between several different origins, a writer still needs to look at each and every single line and decide how to translate the generic dialogue into character-specific dialogue, and if that line fits the personality of multiple origins. That's hundreds of lines in just the alpha.
The generic dialogue pretty much has to stay. I would much rather have that truckload of money be spent on improvements to gameplay.
