Then what were the players supposed to use, if all of those are for the Referee.
My experience, covering some 300+ players over the last 36 years...
In games without a dedicated player's book, few players buy the core set, but most GM's do.
In games with a dedicated player's book, it's still a minority, but nearly half of players will buy the player's book.
My experiences of the last 5 years tend to indicate most players who wouldn't buy a monolithic core will happily pirate it. Especially if there's no legal PDF, or if the game is OOP.
Most of my Classic Traveller players back in the 80's either used my retypes of the tables, or used Judges Guild's
The Traveller Logbook, or simply photocopied the character generation tables.
Note that the Logbook included the core character generation tables and the Bk 4 Merc CG tables. It didn't include Sup 4.... nor Bk5. It also included bk2 trade, some expansions to CGen for homeworld effects, family background,etc. It was, very much, a player's book for CT.