moreover, the various printings of 1E CT and 2E CT are all retypesets, anyway...So realistically, there are about 10 different CT LBB editions
There was an old thread comparing what was in various LBB printings.
1st printing had Jump Torps. by 4th, they were gone. Somewhere around 1979, they smoothed damages to straight dice, rather than dice+mods.
Yes, that happened with Snapshot in 1979. It made the 1981 LBB revision and Traveller Book and Starter Traveller. The old Judges Guild green referee's screen had the original LBB damage (plus Mercenary). I had to retire it...
Until TNE, Traveller was a collection of rules amongst which to pick and choose, and until MT, pretty vague as a setting.
I don't think I'd characterize the Third Imperium circa 1986 as a "vague" setting. I suspect that there were more total words devoted to detailing it than any other RPG setting (except maybe Forgotten Realms, which came on very strong in the late 1980s).
But there was definitely a schizophrenic selection of rules:
3-5 different combat systems -- LBB1 (1st), LBB (2nd), Snapshot, AHL, and Striker. And the LBB1 system was modified with the second edition of LBB1, so arguably 5 systems. Of course, Striker wasn't exactly an RPG combat system (though it worked very well), so maybe 1 less system. And LBB1 2nd ed. officially supplanted LBB1 1st ed., so arguably 1st ed. shouldn't be included.
2-3 different starship design systems -- LBB2, HG 1st and HG 2nd. Again, since HG 2nd officially replaced HG 1st, probably only 2 systems.
4 different starship combat systems -- LBB2, Mayday, HG 1st, HG 2nd, Starter Traveller. Plus, a supplement on missiles that incompletely worked with Mayday and Starter Traveller.
2 different approaches to character generation -- LBB1/Supp 4 and LBB4+ (which typically generated far more capable characters). And there was considerable difference between Mercenary and High Guard's systems.
Had I been out of high school in 1982 and asked to take over the CT rules, I'd have probably:
1. Merged the Book 2 and HG ship design and combat systems, leaving Mayday as a board game.
2. Used Snapshot as the "advanced" combat system and kept the LBB1 combat system as the "basic" combat system. While I personally preferred Striker and AHL, I think that most Traveller players preferred the LBB1 system. Alternatively, I'd have used AHL as the combat system, with the LBB1 turn sequencing for the basic rules and the AHL action point system for advanced rules.
3. Done something to equalize LBB1/Supp 4 characters with Book 4+ characters (I don't know how practical it was to create a Book 4+ style chargen system for all 18 careers in LBB1 and Supp 4).
4. Included all skills from Books 4+ and Supp 4 in the revised LBB1.
These steps (or analogous ones) would not have taken much time or resources and would have made CT far better IMHO.