No... no, it would not. It would centralize web hosting and make it less censorship resistant.
Sure, you could move it somewhere else and have it show up in the address bar the same, but the actual URL has changed and you need to somehow get the new URL into people's hands. And ultimately you've centralized a lot of websites under a smaller number of service providers which, before, would have been on their own domains.
I'm not sure what you describe there but it sounds much more complicated than it is.
Isn't signed exchanges basically CDN's without having to setup DNS? It's in theory no different than using CloudFlare to serve your content, except any CDN can just serve it without giving them access to your domain.
Right, the point is that anyone can serve the content through any platform, which is why it allows decentralization. But I just don't understand why people are hanging so tightly to the idea that a URL is a direct path to a server, because that just isn't true.
Sure, you could move it somewhere else and have it show up in the address bar the same, but the actual URL has changed and you need to somehow get the new URL into people's hands. And ultimately you've centralized a lot of websites under a smaller number of service providers which, before, would have been on their own domains.