Speaking as someone with ADHD sometimes it's the same. It's incredibly frustrating to not be able to maintain concentration/attention and you jump between ideas/things to do. I know for me it massively affected my RL work up until I got diagnosed, with meds and councilling I've been able to become significantly more productive
You know the thing is the lines between a lot of mental illnesses are pretty blurred because usually one or more of the same symptoms are present in different mental illnesses.
Going by their definitions you can have few mental illnesses at the same time...
Lack of focus, for example, applies to, depression, ADHD, PTSD, CPTSD, anxiety, schizophrenia, alzheimer, ahedonia, dementia and god knows how many of them have the very same symptom yet.
And above all else they can only put you in the label which you describe for them yourself and that's why misdiagnosing is so common.
Not necessarily saying cbob is misdiagnosed but he as well could be.