ADHD symptoms are well proven to be treatable in most cases by proper medication. They also help children with ADHD have their brain develop to be far closer to a neurotypical brain, causing a cessation in distressing ADHD symptoms in adulthood sometimes allowing them to be able to come off medication entirely.

ADHD medication, prescribed properly and titrated onto under guidance of a specialist doctor also is not addictive and easily weaned off of.

ADHD is a disability under capitalism, and even under socialism can cause massive issues and certainly can be disabling even under a fairer economic system. We will need to move to a much more accommodating system of work that might still only get an unmedicated person with ADHD up to like 80% as efficient over long stretches of time (short term analysis is pointless because most people with ADHD can completely outperform neurotypical people while a task is novel and interesting to them). It is a tiring neurotype to have as you desperately want constant stimulation and newness that is just impractical to provide in most cases. Not to mention its higher likelihood of co-occurence with Autism that also makes the person crave structure and routine as well as novelty in the right doses, which just throws a big spanner in the works for accommodating them.