I think this is basically the point. Understand the world around you, and especially the connections and influences between different components of a system (broadly defined), to form and verify more holistic, nth-order models rather than disconnected, first-order-only analyses.
I think it goes beyond "cool idea" and really strikes at the same kinds of intuitions that many on HN appreciate as regards simple models that explain complex phenomena. In this sense, then, D&G's work is a sort of "meta-model" for guiding intuitions when building specific models about specific systems.
It is not a predictive framework. I guess I would call it an "ontological/architectural" framework.
(I laughed)
> I find it basically useless in my every day life and work
D&G is of utility in architecture, for one. You need to have some philosophical decoration for your doodle. The art is in mapping bs to doodle. In general, useless philosophy is a faithful companion in bullshit fields. Where in software we could use D&G then? I suggest crypto space.