Someone else isn't going to be thinking about how to put art underground. Or engineer the lights so that there's day and night. Or be paranoid to consider having drainage basins that can take in a tidal wave of water in case someone tries to flood an underground spae.

[Alucard knows it's a weird choice. Geralt's not wrong for commenting it.]

We'll see how far the self-justifications get me in practice though, should it ever need to be used. The nice part was I got to utterly wreck a dungeon created by Thorne.