I think Big Ships are the reality for Traveller. I can't say whether they were always understood to be so, but they certainly have been since 1979.
In other words, the core philosophy for Traveller was not settled in 1977. I suspect it was pretty much settled by the time LBB8 came out, but LBB4-8 also clearly have Third Imperium meterial in them. For example, the names of the megacorps.
I have always assumed that Books 1-8 were modular. A Referee and Players could pick and choose amongst given options to build the "toolkit" they wanted for both their setting and play. For example, does anyone here think one
has to use the system generation sequence rules from Book 6, the trade rules from Book 7, or must use Robots in their setting because Book 8 exists?
My assumption goes deeper down than this as well. Not only is each book modular (and can be used or dismissed at any given table) but within each book we were handed tools and idea to use, modify or dismiss.
For example, in both the '77 and '81 editions of Book 3, the Tech Level charts make no mention of any sort of "average" technology for any interstellar civilization. It was assumed, as far as I can tell, that each group would decide for themselves how far technology had advanced for their setting, what the average was, what might be considered exceptional. (The "Imperial Average" elements in the Tech Level chart were introduced in
Starter Traveller and
The Traveller Book.)
Thus, the ships in Book 2 max out at J-3. There's no reason to assume (or at least I didn't) that there were ships that could do a J-6 in every setting a Referee might create. The rules are there to make such a ship. But as far as I could tell such technology might well belong to an advanced, alien civilization and not available to the PCs or their civilization. It was up to me to decide.
Please remember: all this thinking is from
years ago... back when I was a teen, back when I had bought the little black box containing Books 1, 2, and 3 from the Compleat Strategist in Manhattan in 1977. Everything I needed to play
Traveller was right in that box. If I needed more I could extrapolate it from the materials at hand. And not only did I not feel a lack of any kind with those first three books,
there was no way I could assume more material was coming. (I played Advanced Dungeons & Dragons the same way: I had the three hardcovers, never bought a module or setting materials of any kind.)
Moreover, the additional material that did arrive didn't expand the game -- it offered options on how to play. As Marc Miller said of Books 2 and 5, respectively, in an
interview from several years ago: "There’s the simpler system for the more casual players, and then the deeper system for more involved players."
So, my question: Am I the only one here who
doesn't assume that Classic Traveller Books 1-8 are a complete package that form a whole that has to be treated as a whole? This isn't a challenge. I am really fascinated by this.
And, I guess a second question: Given all the bumps and work and retconning required to make all these pieces work as a whole, why go down that road? Why not assume that that the tools are there to make your own tool box and the Third Imperium is but one example of the kind of setting one can make? Especially as Salochin999 pointed about above...
"Purely on a personal note this subtle shift in underlying assumption between 1-3 and 4-8 is probably what scrambled my mental image of the OTU all those years ago - something I only managed to unscramble recently."
...the shift in thinking between what was contained in the
Traveller black box and all the information that came after is large.
EDITED TO ADD: I suspect a lot of this is an issue of
time: When did a person pick up
Traveller? Which edition? The fact is, a lot of people not only did not experience
Basic Traveller the way I did. But beyond many people who love
Traveller might well never have even seen the original editions of Books 1, 2, and 3. Reading those books is a specific and very different experience than reading
The Traveller Book. (Remember that apart from
Book 4 Mercenary, for two years after the original boxed set was published
that was it.)
I'm sure if I bumped into
Traveller books 1-8 after they had all been published along with seven years worth of material I'd probably assume they were designed as a workable, consistent whole.