If we view it from that perspective, every expansion could have way more lore attached to them. But all of that was deemed a side story and simply not important enough - and that’s the feeling I get from everything you mentioned. It’s just stuff that exists and most will be left out because it doesn’t matter for the overarching plot. Major storylines like the Tyrande stuff will get resolved, but something like the Margraves really doesn’t matter at all from our perspective.