Imagine if Traveller placed so many such barriers between you and the acquisition of an essential mundane skill, such as Athletics or Melee Combat. All these barrier DMs are an artificial mechanism designed to deter the casual player from becoming a psion.
Only, if they didn't want you to play psions, why in the name of Yaskoydray did they put them in the book in the first place? So much easier to say something like "There's no such thing as psionics. Traveller is a setting ruled entirely by Science, INT, and wits alone." That would have been so much easier, and freed up several pages for something like Diplomacy or Research subgames or some such.
Psionics is there, and it should be rare, but seriously the RAW are b0rked.