Consider: ADHD reduces executive functions, which are like the "secretary" of the mind. This means they can not direct attention onto where they need to: work, school, onto family and friends, etc. Those with ADHD have less 3 friendships on average, due to less ability to hold their attention on others. As they age, they may find relief in drugs like cocaine, caffeine, nicotine, and THC, which may lead to more drug abuse than neurotypical people. They're more likely to commit suicide. These are evidence-backed conclusions from the literature, which I reviewed for my MS.

All of these problems then feed into depression and anxiety. Is that so hard to believe? Less friends, less success, more abuse of substances, it's a potentially rough life.

If so, look at these articles, which review the hard evidence and find there's very strong links between ADHD and depression, and anxiety: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2990565/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6493806/

It doesn't matter what you think. It's fairly obvious even without any research that losing some amount of agency and struggling with things others don't can impact someone very negatively.

It absolutely is.