You can ask the same question about most RPGs. Is Call of Cthulhu inseparable from the Basic Roleplaying rules? Clearly the answer is no, because it's been published under half-a-dozen different sets of rules. Could you play in the Imperium setting without using the Traveller rules? Again, the answer is clearly yes, because there are numerous sets of rules available for doing exactly that. Just look at how many different, basically incompatible rules systems are supported on these forums, all carrying the official stamp of Traveller authenticity. So nothing about "the Traveller rules" is inextricably intertwined with "the Traveller setting."
Furthermore, "the Traveller setting" itself has gone through numerous iterations, from Milieu Zero to Interstellar Wars to the height of the Imperium to the rebellion and Hard Times and the ravages of Virus.
So I guess where all of that is going is that, for my dime, "Traveller" is both a rules set and a setting, and at the same time, it's neither. Personally, subjectively, in my world, Traveller will always be those three little black books in a little black box, divorced from any setting but the one I created using the world and sector generation rules.
Steve
Furthermore, "the Traveller setting" itself has gone through numerous iterations, from Milieu Zero to Interstellar Wars to the height of the Imperium to the rebellion and Hard Times and the ravages of Virus.
So I guess where all of that is going is that, for my dime, "Traveller" is both a rules set and a setting, and at the same time, it's neither. Personally, subjectively, in my world, Traveller will always be those three little black books in a little black box, divorced from any setting but the one I created using the world and sector generation rules.
Steve