Depends on your definition of "ideal", and whether you even want to strive for such an "ideal". To me this sounds more like a "sterile" web. If we temporarily assume that humans won't do what they're experts at (finding ways around that system too), and take at face value that this will lead to this "cleanest" web space, we are still assuming that that's what consumers want. I would argue that the very existence, and success, of the web in the face of approximations to this "ideal" space in the native-app-world disproves this theory. We have the App Store, we have lock-down control and identifiability for apps, and yet the web still manages dominate commerce in the face of this. Consumers still end up going to the web, and arguably increasingly so with things like Figma. So where are the cries for this "sanitized" web? The demand certainly doesn't appear to be on the consumer end, that's for sure.
To me that's (again under legal / democratic protections) using some centralised public private key (probably) and a curated env and this is (sort of being very generous) a first step towards that world.