Clip-based workflow was facilitated by technology progress (e.g., Moore's law) which unlocks new design space (similar pattern to why Lightroom was "invented" so long after Photoshop). I.e., doing things real-time or non-destructively as computers get faster is really common, so that happens then the design space gets exhausted again. The key point being this happens quickly once the new approaches are possible.

The piece I linked to makes all these points, as well as addressing your others.