No, I am not even remotely undermining the work that went into it. ANY PLOT takes a lot of work and tracking. And simply reacting even in little ways like. THE WATER BUBBLES. It's not objectively a lot of work, like running a battle is, but it's still hours of oh hey this is in this environment.

But RELATIVELY SPEAKING, running a flood is a lot easier than running a horde of dragons. It is harder, naturally than NOT running a horde of dragons at all, but ... well, not running a horde of dragons and expecting them to be as effective as the flood is why we're here.