Oh, you do not have to convince me! I agree with every word you are saying. But let's stay realistic. No one ever is going to put 250 presets in the game (though... Do Sims do it? They could and probably should. Maybe even did?) However, in DAI, EVE-online and some Asian MMOs they use grid-shape-morph. Very effective and (judging the technology is used in MMOs) not that impossible to implement.
Still, specifically for BG3, I highly doubt it can be done. The engine was not designed for that. Plus, there are so many mechanical problems, so many bugs, plot issues - what they have now for character creator is already much better than many other games. Beauty mods are the first I always get for the games, but even I will say "please, first fix everything else". Even if the teams working on the CC are different, the money they get could be better spent on bug fixing. We
can live with the models we have, we
can not play if the game is full of bugs.
They already added a few heads (maybe more are coming?) So, there is hope. And speaking of heads - there is a "lifehack" to get some lipstick: