I am not into the evil endings myself and will probably only experience them on yt, but I feel they are a part of improving the overall reactivity of the game, which is something I am greatly looking forward to. From what I have read, reactivity to the durge questline has been frequently asked for - and I'd be very happy for some additional lines for the other Origins too. So this seems to be something for the whole player base - even though it might not be as flashy as new companion or a new portion of map.
I agree, I mean, even redemption Durge, which I prefer, has reactivity missing in some scenes. So more reactions are always good.