It really does seem to have been a victim of (ironically) "schismogenesis" between the disciplines. The elephant has become so large people are only seeing parts of it. Off the top of my head I can see the following fragments:
A) cybernetics, in the machine sense: this is all op-amps and servoes, poles and zeroes. Taught as "control systems" in engineering courses.
B) organisational cybernetics: theory of management. If theoretical, this belongs in anthropology. Otherwise it's ended up in a cargo-cult form in MBA courses.
C) economic systems. Left to those economists who actually bother to do some differential equations rather than just writing thousand-word sponsored posts on why inequality is natural, or making catastrophic mistakes in Excel. Nobody's trying gigantic Stafford Beer systems any more.
D) Psychology and psychiatry: control and regulation seems to have become deeply unfashionable to talk about here, possibly due to replacing talk with drugs.
E) The literary wing: cyberpunk. Started as social commentary, but has faded into an aesthetic; nonetheless this is potentially the most powerful one for getting cybernetic thought into general circulation.
G) Environmental control systems: both the dull and dreadful world of IPCC reports on "forcings" and the more fanciful Gaia hypothesis inform us of how we change the environment and the environment changes us.
H) Advertising, gamification, and "dark UX": how can we use control systems and feedback loops through the human brain and emotional system to get people to put the maximum amount of coins in the slot?
The one thing these all have in common to me is the revelation of uncomfortable truths about ourselves, which probably accounts for their unpopularity. The original article talks about B and D with a bit of A and C, mostly pre-dating the others.