The dialoges already get awkward with shorter race npcs. Shorter playable characters will be even more awkward
Ehm ... you know we can make custom character, right?

Yes but larian clearly doesn't want to make the issue worse woth origin characters
It seems like you are missing the point ...
There either is no issue, or its omnipresent.
Depends on your point of view.
If dialogues were problem ... we still have it.
If romance scenes were problem ... we still have it.
If models were problem ... we still have it.
Excluding any race from our party roster dont fix a thing!