There's no fairy dust there, but that doesn't mean we understand how it works. There's no fairy dust in human brain either.

Today's mathematical background applied to frontier systems is a bit like trying to understand how a web browser works from knowing how a transistor works. The mismatch is palpable.

Sure, if you descend to a low enough level, you wouldn't find any magic fairy dust - it's transistors as far as eye can see. But "knowing how a transistor works" doesn't come close to capturing the sheer complexity. Low level knowledge does not automatically translate to high level knowledge.