I have a close family member with actual attention deficit and extreme hyperactivity.

You cannot mistake it with normal bored kid.

It's like his brain works at 100% intensity all the time.

When you walk with him through the town, he has to touch every door knob, climb every tree, look into every single car, peep into every hole. In a room he finds new object so interesting that he absolutely has to investigate it, for like 30 seconds and then finds another thing and another and another. 24/7. You see his body is tired, almost falling asleep, but his brain won't stop, he keeps finding new distractions he can't ignore.

You would never mistake it for just a regular bored kid.

Not that all cases are simply the natural state of kids, but that it's overdiagnosed for that very reason.

"Oh your kid can't sit still and learn about some artificial topic by staring at whiteboards and pieces of paper all day? Better load 'em up with drugs, they clearly have ADHD!"

Sounds like something my Gen X dad, who put zero effort into helping me succeed, would tell me as I failed my way through all school with zero direction or ambition and convinced I wasn't capable of anything useful.

I won't claim more people probably think they have ADHD than actually do, and being bored disproportionately more than most in most situations is absolutely one of the symptoms, but it's a wildly incomplete trivialization of a set of debilitating difficulties that can/do carry long into adulthood. and is heritable.