I don't see where you get this "cartoonish" thing from. Bryan made reference to including some of these things based on other sci-fi souces, some decades old. I'm waiting to see if I can get some clarification on this but quite frankly, I have seen things like this in books myself. The problem is that some people have a very rigid idea of what Traveller is and they can't separate the Traveller background from the Traveller game...and they are different things.
Just because they're decades old, doesn't give these sources any more legitimacy. They were cartoonish then, and they're cartoonish now. 40K is more "Space Fantasy", for example, than "hard sci fi".
Traveller, historically, as a system, has tried to remain anchored as a hard SF world. They even try to explain the handwavium they need to get their technologies to work. Mind, not by using big words from Enyclopedium Handwavius, rather they basically say "This doesn't work because physics says X -- so we have invent Y to try and pull it off".
So, that tack, that direction gives the game its feel. In D&D, magic works one way versus in other games. D&D is a "generic fantasy system", but it really only goes so far in terms of generic.
The mechanics, then, do have an effect on the feel for the system. Even for a "generic" system.
I mean, seriously, let's take D20 or Gurps Traveller. What makes it "Traveller"? D20? Gurps? No. "Traveller" makes it "Traveller".
What makes CT "Traveller"? 8+ task system? The char gen system? Book 2? A UWP? Or is it speed of light comms and the Jump drive? So, if I take D20 Modern and add a Jump drive -- is that "Traveller"?
What about Gurps 4E and Gurps HIGH TECH, plus Gurps SPACE. Is THAT Traveller? Why not? I mean, Traveller is just a generic Sci Fi game, right?
The LBBs presented a "world" view. A technology base, and physical model. A universe with a set of "rules", "how things work in the universe of Traveller". It also introduced a political system and society, ostensibly as by product of the universal laws.
It is trivial to separate the rules of the universe from the star spanning galactic political view of the Imperium. Plop a team on a random world to find a bauble. No imperium, no nothing. Spend an afternoon and roll up a subsector and grab a free trader. Off you go.
I have NEVER played the game "in the imperium". Worried about dukes and nobles and whatever. I play "small traveller". Starships, distant worlds, bush wars, treasure hunting, crazy industrialists.
Are we going to see a "Mongoose Traveller: Star Trek" book? "Mongoose Traveller: Terra Nova"? "Mongoose Traveller: Dark Apothicarium"? I don't think so.
Does "Traveller: Star Trek" make any sense at all? To me, no it doesn't. "GURPs: Star Trek" makes sense. Because GURPs isn't -- anything. It's the most base mechanics. How to make characters and how to break things. GURPs is the "Cold Raw Fish" of the gaming world.
But *I* see Traveller as something beyond "8+ to hit". That's why TNE is as much "Traveller" to me as CT is, but "Dark Conspiracy" is not.
So, I don't know what Traveller is to you. But I can tell you that for me, Disc Flingers, Lazguns and Killboyz are NOT Traveller.
And again, if Mongoose named this game "Starships and Stardust" or whatever else, this debate wouldn't be happening at all.