Many fantasy writers today are scoffing at traditional fantasy character races, but what they don't realize is that interesting characters don't need shiny things like horns or hellfire hair.
Sorry to come back to this, but specifically, by name, what fantasy authors are you referring to?
I'm mentally iterating through modern fantasy, and the vast bulk of it falls into two groups:
1) "Basically only humans" - i.e. all the main characters are human or something very close to it. There might the odd other species but not many.
2) "Basically only humans and elves" - The same but also there elves, which may or may not be called elves.
That's 95% of fantasy written after say, 2010 or even 2000. The other 5% is usually what used to be called "weird fantasy" and may feature stranger beings, but there ain't much of it.
I'm struggling to think of even one non-D&D fantasy novel feature a protagonist with "horns" or "hellfire hair".
So I'm just going to say in advance of you not naming anyone, that I kind of think you've made this up in your head. It reminds me of how, like 10+ years ago, people used to insist "Oh every fantasy novel has elves, orcs, dwarves and so on!", when like, no, 99% (no typo) of non-D&D fantasy novels from say, 1990 onwards also didn't orcs, dwarves, halflings etc. (though elves, yes). Seems like more people read a fantasy novel since then. I thank Audible and Kindle.
They only need personalities that are believable and relatable. IMO, the writers have completely lost the mark on that. I'll take well written characters from simple and basic fantasy LOTR races over this crap any day.
So elves, half-elves and humans? Which is 5 out of 6 companions in BG3 are. Literally people complain about this a ton, because there are no dwarves, halflings, dragonborn or the like as companions.
Have you actually played this game? I don't think you have. But you're acting like you have.
The only modern-D&D-race companion is Karlach. She's not in Early Access except as an NPC, so you've never played with her. And Tieflings have been around since 1994, long before BG1, so complaining about them is one those classic "closing the stable door after the horse lead a long and fruitful life and died of old age" situations.