Not every piece of dialog needs to be changed in order to accommodate every single possible origin.
Correct. That's why I specified origin related dialogues (and quests, relationships, etc).
In fact I have no idea why you thought it was pregenerated characters personally.
Because that was what was shown during the Kickstarter, and allowing fully customizable characters means restrictions on the content or about 10 times the work per origin (not all situations would necessarily depend on race and gender).
Also, that design would limit the types of origins available, to things which could be applied to all races pretty much equally, but the game world is not based on a society of equal opportunity. Using specific characters allows unique, and potentially more interesting, origins.
I'm not taking this personally, either. I can see the appeal of having an origin that adapts to character customization, even with the (possibly minor) limits that still places on the design. However, personally I don't value character customization enough to say 1 adaptable origin is worth the amount of work to (I'm going to guess) create another 3 or 4 extra unique origins for specific characters.
