I mean, Serini did intend to build the dungeon partially as Kraagor - a barbarian who valued physical strength above all - wanted, right? So it does make sense that she'd take special care with anti-mage features.

That said, given that she was basically the only Scribbler who seems to have made efforts to look beyond her own preferences when designing defenses in the first place, I'm inclined to agree that it's mostly just meant as a general purpose dungeon.