You are pretty much on the money, Oz, when you talk about a demarcation issue.
Some of the details are fuzzy cos it was nearly 30 years ago, but I remember when I worked in FS in Adelaide, a bunch of nerds turned up from Canberra talking about something they called a flight plan display. It was screen based and the concept was much like what turned out to be TAAATS. Some of us spent a day or so explaining what FS entailed and they went away happy. We sat back and waited to see this piece of kit turn up.
Meanwhile ATC got wind of this and the reaction was "no f..ing way are those smellies getting a screen display - that is ATC kit" Of course, ATCs and FSOs in Adelaide were barely on speaking terms, or at least there was a vocal section of both that promoted that situation so it was no surprise what eventuated.