One D&D is going to change "races" to "species" while also making it possible for more halflings to exist. That's entirely illogical. It's harder for creatures of different species to produce offspring, if not impossible, whereas different races should have no problem. Beforehand, the species was "humanoid."

Maybe because "races" is better off being the difference between a black human and a white human, or a green dragonborn and a blue dragonborn, but that seems like it goes in the opposite direction of their intention. Very strange to just stop calling humans "the human race" that consists of all sorts of variety, and swap it to species which implies the existence of races within those species being different.

You see this sort of thing all the time with politically correct changes, though. For instance.... Where did all of the dark-skinned people go between Rings of Power and The Hobbit? They must have either left Middle Earth entirely or been wiped out. It's a major plot hole introduced to make sure everyone feels included. Or, an even better example, the whole "orcs are black people" meme. Nobody actually thought that. Orcs were just orcs, a fantasy race, but this immature insistence that fantasy must always reflect reality really gets people's heads twisted.