In WotR you get a single human companion in a city where the majority are humans.
Le what?
You literaly start the game with three humans (Seelah, Cammelia and Anevia), two of which are permanent companions. Then you get Sosiel and his brother, Trever later in the game. That's four overall, and two in Kenabres straight from the beginning. If you are a lich, then you can have nearly all human party, albeit undead - Delamere, Ciar, Kestoglyr, even Galfrey herself.
Oh by the way, mongrels are humans too - corrupted by the Abyss, but ok, you're entitled not to see it that way.
You try to make it like everywhere we should have some quotas, but if so, we shouldn't have any non-human companion, because that's what Worldwound demographics are on crusader's side. It would be stupid and boring, but hey, some autists here would be very happy to play their own fantasy in crpg.
I play RPG's (tabletop and crpg) for 25 years (my first AD&D session was in July 1997) and it was always that way - we all knew that humans make 90% of population, but we played dwarves, elves, halflings and even gnomes for fun and for the good laugh, to please ourselves. I DM'd a session, where all players were oddballs, ie. centaurs, satyrs etc, because we were interested in how would this play out
against nearly all-human community, and that was one of the best sessions I ever had.
I know that there are many snowflakes in the american fandom who has to be as strange as possible, but what you are doing is the same extreme, but taken from the opposite site. If non-humans in your party make your game nonimmersive for you, you can shrug and make your own mercenaries as you see fit, play with human companions and mercenaries and that's perfectly ok but don't blame others who like to have different companions from different cultures and races around.