Is this intended or am I missing something like I have to be level 50 or something?
I'm just reading in Jarulf's Guide that Barbarians can wield 2H maces and swords with a shield, but I can't seem to do that. I know that the Barbarian in Belzebub is different than the datamined/Hellfire one, so is that just something that isn't available in Belzebub?
There are a couple of Off-hand weapons that are available as Set Items.
That would sort of give you some dual wielding options if your heart is set to it. But by that level in Torment, any char must revert to fast weapons with Ignore Defenses to even scratch bosses.