I think dmccoy's question is rather misleading - it's not a case of "why play this and not D&D?", because they're not mutually exclusive.
I think people are coming up with "Fantasy Travellers" because:
a) the game hasn't really supported that genre (beyond an inconsequential nod to the existence of TL 0 and TL 1). So there's a gap that some people perceive should be filled.
and
b) they can. The OGL lets people write anything they like for the Traveller ruleset, and it doesn't even need to have "Traveller compatible" on it (I'm kinda wondering what one does call it if it doesn't though - "2d6 OGL"?). Why shouldn't people write Fantasy versions of Traveller now, or Noir versions, or Modern versions?
These appeal to people who like the Traveller rules, and who don't necessarily have any interest in playing D&D or anything else. That alone is good enough reason to do it, IMO.
I think people are coming up with "Fantasy Travellers" because:
a) the game hasn't really supported that genre (beyond an inconsequential nod to the existence of TL 0 and TL 1). So there's a gap that some people perceive should be filled.
and
b) they can. The OGL lets people write anything they like for the Traveller ruleset, and it doesn't even need to have "Traveller compatible" on it (I'm kinda wondering what one does call it if it doesn't though - "2d6 OGL"?). Why shouldn't people write Fantasy versions of Traveller now, or Noir versions, or Modern versions?
These appeal to people who like the Traveller rules, and who don't necessarily have any interest in playing D&D or anything else. That alone is good enough reason to do it, IMO.