It's a really huge systems change last minute to alter racial attributes at the last minute after a 3 year beta. For a lot of people BG 3 is the first chance to play full scale Dnd so using existing 5E rules should at last be an option.
I dont know if the stuff with humans getting Polearms and extra carrying capacity is true or not- but I sure hope not. I can always play with a mod of course- so this won't ruin my fun but we shouldn't have to get a mod to fix this.
Bg3 isn't a tabletop simulator, and never tried to be one, also these changes come right out of tabletop anyway.