These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: With the release of several new editions over the years all of which drastically changed the key premise, it was inevitable.
Creator Worship: There is a reason the 4th edition was called "Marc Miller's Traveller".
Doorstopper: The latest iteration of the Traveller rules, Traveller5, clocks in at over 600 pages, quite a few of them random roll charts.
Fanon: The setting practically invites players to fill in the blanks with fanon, referred to as "IMTU" for "In My Traveller Universe".