Exactly. They design of the dungeons literally didn't make any sense and the only type of building I can fathom them being thought of is a tomb. They don't seem like forts, definitely not cities. It just made no sense at all, just a generic old ruin with no purpose and alot of undead.
I agree, if I think I understand you correctly.
The dungeons in Oblivion, all forts and ruins and stuff, weren't actually ancestor tombs as far as I understand. Never meant to be either. That there were caskets and such in some felt more like generic dungeon stuff to fill out as containers for generic loot.
I want places in Skyrim that were specifically build to be a tomb, like in Morrowind. The tombs in Morrowind were exactly meant to be tombs. It wasn't just some casket in a cave or ruin. It was a dungeon/tomb specifically meant and designed to honour the dead and give protection to the (dead) family's resting place.