There’s a risk of ANYONE using something as an excuse for their behaviour or work ethic, so yes, i’m sure some people with ADHD are grifters just like anyone else.
The vast majority of us, however, have spent a FUCKING LIFETIME feeling stupid, useless, lazy and pathetic, being told to ‘try harder’, and wondering why we struggle so much with things that everyone else seems to find easy. You can’t ’put effort in’ to ‘improve’ ADHD any more than you can ‘put effort in’ to ‘improve’ needing to use a wheelchair or a pair of glasses.
ADHD is not an affectation; it’s a potentially life-ruining disability. It has cost me jobs, relationships, grades, and large chunks of my own self-worth. Being diagnosed and medicated (in my thirties) has been like night and day.
If it helps, here’s an analogy - if someone can’t walk and needs to use a wheelchair, then lots of helpful adjustments like ramp access, low counters, etc will be of great help - but ultimately, what’s going to allow that person to get from place to place is their wheelchair. All the other adjustments are useful additions but don’t fix the issue of needing to get around in order to fully enjoy life and participate at work and school etc. ADHD medication is the same - it’s the thing that makes us able to function, and reasonable adjustments help smooth the way.