Sure css, js etc are fetched, but this is hard-coded behaviour, there is nothing dynamic or discovered about it. Or I fail to understand it.

This may well be the problem then, as we can see here and elsewhere. Many people like me don't understand. The claims are too vague. We need real-world exemples of how this can be applied with clear benefits. Mere transposition of the hypertext qualities to a medium intended for machine consumption will not do it for most of us.