Now, I have not read all 22 pages of this thread. I'm not sure if this has been brought up before. But one observation that I have made is that Traveller is pretty much ENTIRELY absent from any and all game stores across most of the Midwest. I'm not sure what that looks like in other parts of the country. In five years of going anywhere from Columbus, OH to Chicago, Detroit, and the greater Grand Rapids region, I've seen ONE store that had a single MgT2 book (which I promptly bought). I talked to a few people running the stores, and few even knew what Traveller was. Did I talk to the wrong people in the wrong stores? Is anything MgT2 just constantly sold out here and I'm getting a wholly wrong picture?
I had no problem at all getting a group together in West Michigan. So the INTEREST is there. And granted, this is just one (populous) corner of the U.S. I am just oddly amazed that on the one hand, Traveller seems to be doing pretty well with Mongoose, there is a pretty steady output of new stuff - but I'm just not seeing any of it on the store shelves here. And I wonder why that is.
And hey, I am very much a part of the bigger problem since I bought all but one book of my at this point sizeable MgT2E collection directly through the publisher and not from local stores. Those free PDFs are hella enticing. But I think if Traveller is supposed to get more popular with TTRPG players, it needs to show up where the players are. Granted, these days a lot of people are like me and just buy stuff online. And stores are less and less the community hubs for the local TTRPG scene(s) they once were. But the absence is kinda striking. Or maybe I'm just not seeing things right...?
That being said, as someone who came to Traveller rather late in his TTRPG career, I do agree that a huge omission from the MgT2E line is a setting primer. It took me quite some work to familiarize myself with Charted Space enough to be comfortable running a game. Because what's now left of setting description in the core book is just a few allusions here and there, and a half-ish page each for Aslan and Vargr. The next highest density bit of information is basically one of the 300~ page sector books, or one of the alien volumes. And that is then also not helped by the sector books having rather nondescript titles. I get that this is "tradition" and Behind the Claw has always been called that, etc. But I had to ask around the Traveller reddit for where to even start. Charted Space is a really cool setting with an overwhelming amount of depth, but it really needs a primer.