Certainly, but from estimates using ship designs we can see that drop tanks would revolutionise civilian jump shipping, long-range freight prices would plummet (or shipping line profits would soar), unlike current air transport.
In Traveller the civilian sector would rush to be first with drop tanks. How long would the Navy be able to keep something secret that the megacorps really, really wanted? How long would the Emperor allow the Navy to keep something secret that could significantly stimulate the Imperial economy?
At a guess, the answer lies in that dirty word you just used, and the cultural underpinnings of much of the Imperium. The deeply, almost comically, conservative Vilani do not react well to "revolutionary" ideas.
For starters, the drop tank revolution would immediately threaten a five thousand year old (at least) revenue stream as the primacy of the old Vilani ship designs (Hero/Beo (A), Akkigish (R), and likely many others) are challenged at a fundamental level.
In addition, the wording of that original TAS News item strongly suggests that the drop tank process had a lot of bugs to work out. That's the sort of thing you hand to the military, since they are being paid for inherently dangerous work, and let them figure out explosive bolt and/or separation charge patterns, necessary distances and thus jump charge hold times, and a thousand and one little technical challenges. All properly protected by millennial Vilani patent derivatives, of course.
I suspect that none of that was a secret to the megacorps; on the contrary, they were likely helping the process along by letting, if not demanding, the Navy and Scouts do the heavy R&D lifting.
Drop tanks also require some amount of trash collection, as I noted earlier. The Navy won't lose money chasing down prototypes precisely because they *are* prototypes and need to be dissected after use. By contrast, the megacorps got to be mega by not throwing money away if they could help it.
Once the processes are understood and the necessary infrastructure properly amortized, the use of civilian drop tanks will creep outward from the core.