I think it's beneficial overall to have the research on ADHD in one place even if it has little practical advice. While it might seem like ADHD is a very normalized condition, there's still some misunderstanding in many countries and regulatory bodies.
In the US, where ADHD is most normalized, ADHD can impact your ability to get a commercial flight license which includes recreational flying of certain aircraft [1]. It may prevent you from joining the military which many need to afford higher education [2]. Outside the US, it gets worse. Stimulant treatment in Europe is difficult and underutilized despite the evidence [3]. The strangest effect I've heard (anecdotally) was that ADHD diagnosis can increase mortgage interest rates in Sweden (or maybe it was Norway?).
It's strange that ADHD is both rejected as not-real or over-diagnosed and also treated as a severe condition by certain groups. Even if these negative effects can be mitigated by changing medication or getting a medical waiver, it discourages individuals with ADHD from applying and adds more bureaucratic cruft as a cruel joke.
[1] https://www.faa.gov/ame_guide/dec_cons/disease_prot/adhd [2] https://www.armyupress.army.mil/Journals/NCO-Journal/Archive... [3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2942810/