"large or small" wasn't referring to the size of facial features, rather the significance of the parts of the coding that control functions and gameplay. I have absolutely no idea whether code for controlling the chances of hair colour or facial features coming through, is a small, large, simple or complex part of the code in that area or the whole game. My degree is in Commerce and my current one is in Classics and Ancient History. But obviously code, or what I'm generalising as code because I don't actually know, is an area the modders experiment with and change to achieve the tweaks of the game they do.
But I would think, imagine, that if its not already in the code, the game, it would not be able to be modified. It wouldn't be able to be created brand new. So then if its not possible for grandparents' genetics to come through, if the mechanism for it doesn't already exist in the game, whether in a small or dormant, or large and obvious way (not referring to size of the genetics, but significance of the code), to then be able to tweak and modify, then it wouldn't be in the nraas mod.
They don't get a new face. They kind of change into more of a copy of their parents instead of the interesting blend they seemed to have as a child. Its something addressed by one of the options in one of the nraas mods. When I saw it in there, I thought to myself I've seen that happen.
As far as what you're talking about on a bit of a tangent, the large or small facial features affecting social privileges or attractiveness, its actually multicultural because its a globally distributed game. So in other countries and cultures different looks are considered attractive rather than Barbie and Ken. 'less-than-attractive' is in the eye of the beholder. And actually, in the study of Organisational Behaviour, I learned that less popular personality traits and types, even in the dark triad of narcissism, machiavellianism and psychopathy, those people are still valuable and useful for roles the more popular ones aren't, and that they are even necessary to complete the diversity picture, which is conducive to creativity thus innovation and problem solving.
My screen name Divinyls_Fan hasn't changed since I joined back in the days of Sims 2, in about 2007, so thats nearly 20 years worth (rounding up) of playing on and off, observing and not. Who knows how many sims that adds up to. But I'm not an expert. However I am an expert on my own game, as everyone is.