Should ADHD be defined more specifically?

Fails to give close attention to detail, makes careless mistakes
Difficulty sustaining attention
Doesn’t listen when spoken to directly
Doesn’t follow through on instructions, doesn’t finish things
Difficulty organizing tasks/activities
Often avoids, dislikes tasks that require sustained mental effort
Often loses things necessary for tasks/activities
Often easily distracted

Six of these behaviours are supposed to show ADHD. Is this not too general. To illustrate almost every child has these behaviours to some degree.