Christ, that is a trite oversimplification or complete misunderstanding. ADHD includes worse outcomes in employment (lower wages, difficulty keeping jobs), relationships (impulsivity can lead to anything from speaking before processing to forgetting plans to seeking out more stimulating things in lieu of relationships), health (higher rates of car accidents, higher use of recreational drugs, difficulty with self care), and a bunch of other things. It doesn't "develop" over time from looking at your phone. Please please please do some actual reading of things by experts in the field on it before saying this sort of thing again.