I agree that too often, the layout of levels does not look real, as the space they represent (living quarters, warehouse, reactor, office, prison...) don't look like they could fulfill their function. Sometime they just feel like "game space".

And it impacts negatively any kind of immersion.

So I think it would be beneficial for level to be a little more believable in that regard, as it would improve the games.

Of course it only apply for games where such things are important and for players who dislike this break of immersion.