This is a well-thought summary. I believe I can spot your initial stand-point biases, as I am trying to uncover mine ;).
You dedicated a lot of your thoughts towards digital product design being an evolution of the print design process. However, this POV does not fit the whole interaction design discipline and all the possible scenarios.
I am an ex-civil engineer — structural designer. This is not a mass production industrial design discipline, but I am still trying to wrap my head around the fact, that someone would propose “just build the bridge directly”. The industry moved on from 2D paper drawings, but still, tons of virtual paper is scratched with countless variants of every single detail, there are many virtual simulations and artifacts communicating various intentions to various functions and controlling entities.
I don’t think we can land at a single toolset and process, however, I share some of the pain of ridiculously stupid design tools not being able to accommodate basic interaction patterns such as tables or forms.
