I don’t think you can compare ADHD to a heart condition! One is life threatening and clearly needs medication, the other is a spectrum with people affected in different ways.
If people could take one tablet for life (but it caused lots of side effects) and never be overweight do you think people would sign up? Or would they continue to manage their weight using lifestyle factors such as sensible diet and exercise? Some would, but I think it would be fairly easy to see why some wouldn’t.
My 7 year old has ADHD and isn’t medicated. Instead we manage lifestyle factors to limit the impact his condition has on his wellbeing. We will do this for as long as possible before giving him medication that affects the way his brain works for a condition that isn’t life threatening. We make sure he has a health diet, is in a supportive school that understand his needs, has a calm and stable environment at home, is given processing time and space etc.
There are lots of things that can be tried before medication, such as in many other medical conditions.
I am not against medication at all, but I don’t like the statement “oh if it was xyz condition you wouldn’t think twice about medication”. Well no, maybe people wouldn’t, but that’s xyz and this is ADHD. You can’t compare.