Castle in the Sky's Laputa: Was it REALLY so advanced?

Okay, sci-fi nerds, let's talk Laputa. Castle in the Sky is, like, visually stunning, right? And the idea of a floating, super-advanced ancient civilization is classic stuff. But I've been rewatching it lately (for the millionth time, tbh), and I'm starting to wonder just HOW technologically superior Laputa actually was compared to the ground dwellers. Think about it. Their robots are cool, sure, but they're also kind of clunky. And the energy blasts? Effective, definitely, but not exactly subtle. And then there's the whole falling-apart-crumbling-into-the-sky thing. A civilization that supposedly mastered anti-gravity can't maintain its infrastructure? Seems sus. My theory? I think Laputa's 'advanced tech' wasn't necessarily about groundbreaking engineering, but more about their exploitation of the levitation stone. They probably figured out how to weaponize it, power their city with it, and control robots using its energy. It wasn't necessarily that they innovated in every area of science, but that they just hit the jackpot with this one incredibly powerful resource, leading to a disproportionate power dynamic. Kind of like how the industrial revolution happened because we figured out how to weaponize (kind of) steam power. It feels like the tech in-universe has a similar root here. I mean, maybe Muska was right about ruling the world, not because of Laputa's intrinsic superiority, but because nobody else understands or can control the levitation stone as well as the Laputans. Just a thought! What do you guys think? Am I completely off-base here?