"...only being able to add points to abilities you already have: -20%." (p. P64).
It's actually very flexible, because not only can you increase the level of any ability you have, you can also add any enhancements you want (GM willing). You could turn a ranged attack into a melee attack by adding Jet or Melee-Capable, or add Affects Insubstantial or Underwater only when you need it, change an offensive attack into a defensive Wall, add Selectivity to turn off enhancements, etc.
If you can only improve
some of your abilities, it's
more of a limitation.