Behavior modification works with SOME of those cases, and takes time. For others, it won’t work because without medication, they can’t process. So you’ve wasted time discovering it doesn’t work - and in elementary school, that time can be the difference between getting pegged as a bright kid who is college bound and a troublemaker who might not get through high school - and how you are pegged follows you.
I have an idea. Let’s run a battery of tests on someone and put some metrics around their ability to process. If they have borderline ADHD, they get a diagnosis and therapy and special services in school, but not medication. However, if testing shows - as it did with my daughter, that 98% of people sequentially process information better than she does, and 99% of people hold more than one idea in their head at a time better (she is functionally brain damaged without meds - she has a genius IQ though, so it took a long time to hit the wall), then you medicate because someone with that level of processing disorder will not benefit from behavioral therapy without medication - like a kid who cannot see with glasses will not learn to read simply by throwing more phonics at them. And a delay in getting them the medication means a delay in having them learn those habits - as well as a delay in having them be able to perform to their potential at school - which limits their opportunities
(And, this is what is done when the diagnosis is made according to accepted medical protocol. ADHD may be overdiagnosed, but that doesn’t NECESSARILY mean those diagnosis are all medicated. My husband is diagnosed, but not medicated. My brother in law was diagnosed, but not medicated. My son was tested, and not diagnosed, my daughter was diagnosed and “whoa Nelly!”).
I completely support that ADHD needs to be properly diagnosed with the battery of tests (which are really expensive). And that medication shouldn’t be handed out when it isn’t needed (when we were self employed, my daughters meds were $300 a month - also not cheap). But I completely disagree that behavioral therapy should always be tried first - because in my experience, the testing is complete enough to provide a good indicator of when behavioral therapy will not be helpful without medication - and in my experience, a six to eighteen month delay while the rest of the class moves forward without you is very difficult to make up.
(On the delay side of things - it was a three month wait to get an appointment to start testing. Testing took another two months. Getting her into a behavioral therapist took another three months. Had we not medicated, we would have spun wheels with the therapist for many more months before we saw improvement).
I also think that we need to change our educational system so that teachers don’t need an IEP to tailor education to a kid - and are encouraged to let kids succeed with more subjectivity. That includes smaller classes, more teachers aids. The need to get your kid some sort of label so they will be able to reach their potential at school rather than get treated like a part to be moved through the factory (that makes shitty parts and throws 15% of them away), contributes to half assed diagnosis and unnecessary interventions.