Yes, so - how does this make a difference? These qualifiers are subjective and add nothing on top of the diagnosis criteria above. "persists for 6 months" - so

Yes, so - how does this make a difference? These qualifiers are subjective and add nothing on top of the diagnosis criteria above. "persists for 6 months" - so you don't get Ritalin for the first tree you climb. Good. "maladaptive and immature" = the "out-of-lockstep" factor I mentioned in my comment "The disorder impairs school, social or occupational functioning" = you keep doing these things even though teachers and parents get annoyed at you. It's hard to be "guilty" of doing the things in the list repeatedly, without also fulfilling the qualifiers.