> The reason Google and Facebook dominate the internet has little to do with technology and much to do with economics, namely scale economies and network effects.
And the network effects can only happen because there is a tight coupling between the data (contained and scrambled within the HTML page) and the presentation. Had data and presentation be decoupled, I could have combined network information from various providers and present it to me in one overview.
> I'll grant that CSS is a mess. What else?
Everything. The security model, the fact that the user has limited control over their identity (and it is not build into the protocols), the multi-threaded nightmare, no component standardization, very limited integration with low-level OS systems, the 'one-tab is one context' metaphor, the box-model, the misfit of page-to-interaction (and the history API), the non-existent voice interaction, the color-model, the DPI/pixels/ems transformations, the invisible local storage we barely manage, the resource utilisation, the lack of uniformity in the programming model, the peer-to-peer communication (WebRTC does not count, since it is not standardized and has quite some flaws), the lack of (easy) customization abilities (high-contrast websites), the limited math-rendering, the enourmous complexity... I could go on.
> You can create multiple URLs that point to the same object.
Yes, but they would not denote equivalence. I could use a redirect, but then one system needs to know the representation of the other. It would be fundamentally asymmetric.
Also, it would contradict the term Unique Resource Locator.