Let me stand up for the military gamers
Most of my group is active military or ex-military. We enjoy games like Star Cruiser and Brilliant Lances as well as lots of 25mm Skirmish and Platoon level Sci-Fi. Even 1/300th stuff. So some of us *are* going to want to slug out the Kafer War...
As to what got most of my players most interested in the game originally: Britain, France, Germany and China as big players in a universe that felt like late 19th or early 20th century - with naval powers, with power politics, diplomacy, and a chance to take on the French (or be them)!
So, let me speak in favour of spy-fi and military games and supplements.
Frankly, exploration should be a strong suit of 2320AD - it has this as a differentiator from T20 and the OTU. But it smacks of nationalism, power blocks, diplomacy, and when the Kafers show up, war with a reasonably implaccable enemy. That's strong stuff from which many good stories can be told.
My group isn't likely to be a bunch of Scout types when we play Traveller (a token merchant or rogue, plus a bunch of ex Navy and ex Marine types, a lot like real life!). When they play 2320 AD, I just know one of them will be a British RSN Officer or a Canadian Navy Officer, another will be some form of ground pounder, another will be another Navy sort, etc. We'll do all sorts of adventures, but going to check out 'what's out there in the bush that isn't sentient' won't be of that much interest. Most of the interest will be in other humans and what they are up to.
So, perhaps that means I have to get out my quill. If so, so be it
but I think it would be wise to have a good balance of adventure offerings.