Mastery points, and storytelling
All the masteries required by story are lv1 and 2 , which could be done in a matter of hours just by exploring.
Some must fight so that all may be free.
Not sure what you’re talking about….the point is if you level to 80, and want to do your personal story, season 1, 2, you are wasting all the xp you get doing those things until you skip ahead in the Guild wars storyline and unlock masteries in the HoT content.