It may also help in part to prevent further deterioration of existing abilities and help them compensate for skills that are unlikely to be fully developed. (teachermagazine.com.au)
The rather large skill tree not only strengthens existing abilities, but it also allows players to add new combos to his already expansive move - set. (playstationenthusiast.com)
Is patient improvement the only measure of success, or is it also maintaining existing ability levels? (sciencedaily.com)