Basically the whole Origin system is flawed. It sounds great on paper, but writing and voiceacting each of the Origin characters for every possible answer in every dialogue would have been a monumental task. Same as with the Custom characters.
If you look at games where the MC is fully voice acted, such as Mass Effect or even the Dragon Age series (except for the first one) the dialouge options suffer for the voice acting, and may only provide you with 2-3 choices instead of 5-7 as this game does. And on top of the Origin characters, for the custom characters you would need at least 2 VAs, one for the male and one for the female versions, and possibly a few for the different races to sound good as well.
I am not sure how are VAs paid, by the words, sentences or the hour, but honestly, beyond the sheer size of this work I think it would also put a ridicculus strain on the developement budget as well and really wouldn’t add that much to the game experience.
I think having non voice acted MCs in exchange for more dialogue options is a good traid off.
