Speaking as someone who was diagnosed with ADHD-PI as an adult I can assure you that it is an affliction and there is nothing normal about the behavior. It's not just that someone is prone to daydream and with a more compassionate environment you could leave them as they are. Some (if not most) will need to be treated just to be functional at all in any environment.

I don't doubt that some people have forced drugs on their kids to try to get them to some next level in productivity but in the case of someone who needs those medications it's really more about getting somewhere close to the same level everyone else operates on even if only for a few hours of the day.

If you do end up with a child who appears to have ADHD the best thing you can do is get checked and if they are diagnosed start experimenting with treatments to see what the kid needs. The longer you wait the harder everything becomes.