'Argument,' as in point of view and how people support it. I've never used these words right, I just copy how other people use them
Morrowind's dungeons do have different rooms which give the impression that they were used, I'll admit that. But so did Oblivion's dungeons. Whilst this was most obvious in the forts, and the caves, it was also present in many of the Ayleid ruins. The goblin caves are actually quite sophisticated.
There are distinct rooms, such as barracks, armouries, throne rooms, eating areas, kitchens, treasuries, entrance halls, and defensive positions in many of them, complete with furniture and appropriate objects that didn't even appear in Morrowind.
The Dwemer disappeared in 1E710 (or it was near there). The Ayleids were no longer the rulers of Cyrodiil a long time before then, and although they still had a presence, it was essentially meaningless in the Cyrodiilic Empire.
The Ayleids would not have used ovens, as they thought that fire wasn't pure, and they would have had little need for currency, regardless of whether they could make it or not, as a barter economy would have been far more practical in such a violent society.
And we know that the Ayleids also hid their treasure behind security systems.
Before I answer many other points, I think it's odd you haven't come across that in the game. How much of Oblivion have you actually played?