From the campaign:
Children are the most creative of people. Many inventions like earmuffs, crayon holders, and underwater talking devices have been created by children. Unfortunately, in the creative world of tabletop RPG gaming, the writers of the rules make the game inaccessible to many. The language in the Pathfinder Core Rulebook is written at 1300L, similar to first year college textbooks according to the Lexile Framework for Reading. Atlas Kings will make OGL-style rules more accessible to kids both in the language used and the simplification of the rules set.