The key difference is that ERC-721/NFTs are a neutral platform not owned or controlled by anymore. Those systems were run by a corporation that could pull the r

The key difference is that ERC-721/NFTs are a neutral platform not owned or controlled by anymore. Those systems were run by a corporation that could pull the rug out from under you at any time which means no company in their right mind would risk their success building on a system that could be turned off or used to coerce them at any time in the future. You can build on top of ERC-721 since you know it will be around in the future and it's stable, like HTTP before it. Neutral systems are a prerequisite for large groups of stakeholders to cooperate.