The actionable part includes stimulants, but also self-awareness and structure. Stimulants alone won't usually lead to the kinds of changes that improve quality of life. Virtually any clinician and expert on this topic agrees with this point

I don't understand your question about whether or not the "ADHD" part is necessary. Yes, we should have words for complex ideas.

The comparison to shamans and tarot readers comes off as dismissive and uninformed, and generally in poor taste. Ultimately you are questioning a diagnostic framework that you don't understand very well given your other comments. There are critiques to be made and even aspects of your position that I agree with but you really need to understand the framework you intend to tear down before tearing it down