The Guild Hall Skill Trainer only has the CORE skills, not the chapter specific skills. Personally, I htink it should have all the skills you have unlocked, but I don't work for ANet and so have little say in the matter
You would think they could code the trainer to know whether you had both campaigns and what skills you have unlocked, it sure would make the NPC more useful.
The guild hall skill trainer is a waste of money. For all that it cost, you should be able to get more then core skills.
I love having the merch, runes guy and the others in the gh tho. No more running around trying to find storage and the like. They are all right there, close together.
To clarify, "Core" skills are those available in both Tyria and Cantha.
Any skills that are unique to Tyria or Cantha are not available at the Guildhall skilltrainer.
[suggestion] Why cant the trainer be exactly like the town ones? He should have the same skills available as the trainer in the furthest town that your character has reached [/suggestion]