Wait... unless I'm missing a lot here, the concrete parts of cybernetics became known as control theory (and the more wishy-washy parts are known as "systems thinking"), and in both cases, the primary idea behind it all is exactly to turn dynamic problems into "simply a matter of computing".

That's literally what the whole thing is about - you model a problem as a bunch of cybernetics/control theory equations (with or without helper diagrams of boxes and arrows), do some computing on it, and implement the result in the physical world. In many cases, the computational model is partially included in the result itself - the physical control system includes a computer (whether it's an analog or digital one) that keeps the physical system stable by means of computation, i.e. "simply a matter of computing".

(In general, I feel many people didn't get the memo: "computing" isn't something "techbros" do; computing is a fundamental part of how we understand the world works - up there with energy conservation, thermodynamics, etc.)