I would like to see the persimmon tree.

Nah, there isn't a single dwarf companion in Baldur's Gate 3. Why? Because not many people would romance them (as if that's a requirement).

Considering how many people were obsessed with the goblin NPCs, there would have been an audience. I'm not so sure about the others, though. In principle, there is a gnome who is a semi-companion (an NPC who hangs out in the camp and has his own questline). In my opinion, he's one of the best NPCs in the game, and he's written in a "simpler" way, closer to the companions from earlier games, rather than being just another chosen one with a bunch of extra bells and whistles. I would personally be glad to see him as a full-fledged companion, especially since he has his own personal arc and character development. But I agree that Larian made the cast very one-sided if you look at the existing companions: three humans (Will, Gale, and Minsk), three elves (Astarion, Halsin, and Minthara), two half-elves (Shadowheart and Jaheira), and one human with a touch of otherworldly blood (Karlach). The only exception is Lae'zel, if you ignore the fact that even githyanki, according to the lore, originated from humans. Ironically, she is also one of the most down-to-earth companions, without any of the extra bells and whistles like a super-artifact in her chest. I agree with the likely reason for this approach.