One of the many things I love about Larian is that they have basically done away with the hackneyed trope of the typical dungeon - with long perfect corridors that go endlessly in various directions - all built with the precision of a battalion of master Masons - for no reason whatsoever.
I don’t know, if done well I find those very charming, I don’t find it unthinkable that someone if D&D world would made an effort to create an elaborate dungeon to protect or imprison something.
Not that I don’t appreciate if there is a good story layer on top of the dungeon - which to me a all there is to a dungeon that doesn’t look like an old school dungeon. But if gameplay is top, a basic dungeon can do just fine.