It’s goes like this, if blizz have a latin datacenter they would probably take the latin realms off the “queue group” we are in today and we would (prob) only queue in random stuff with ppl from the same group as ours (that would be only south america realms). And this (prob) includes pre-made groups.
That’s why EU don’t queue in with Americans and the same goes to Asians, we can’t even see the premade groups they make. So, with that in mind, we don’t have the realm pop to play on our own. The same goes for oceanic realms.