I also agree. However, I would also like to add that, at least in my experience, it may be necessary to make several external changes. For one example of my many diagnosis, I was diagnosed with ADHD at a young age. If I am surrounded by people and things which are filled with distraction, it takes far more vigilance and effort to keep myself from being distracted. But if I am in a mostly empty room, it is far easier. If I'm in nature, the challenges of ADHD, bi-polar, and PTSD are almost none--I'm sometimes then at an advantage. And when I am in samadhi with the charisms, I have what appears to be a tremendous advantage, considering the mind of an "ADHD" is inclined to the most pleasant and vibrant of sensations.
I find the majority of us with "mental illness" are actually super-sensitive individuals, and so we are practically forced to "hone" ourselves. And so I've found things like quality of food has a great impact on how easily we can avoid the negative ADHD, depression, anxiety or bi-polar attributes. I stick to a mostly vegan, organic diet. Sugar, animal food of any kind (eggs included), fast and processed food are debilitating to the mind and body, and I simply refuse to touch them anymore. Going for daily walks in nature is ABSOLUTELY CRITICAL for those of us who suffer from the different mental functions of the "mentally disabled". Even the Buddha went for walks in nature often. The walks tend to keep us from lowering our threshold for mania, anxiety and depression.
There is only so much external changes one can make, but they certainly help a lot. They also teach us to pay more attention. Once one makes the necessary progress along the spiritual path, in my experience, one discovers the advantages to these so-called "mental disabilities". The duality of life dictates that there must be an upside to mental disability as well. The external changes mentioned above eventually become less of a necessity, and more of a treat.
In regards to your comment about coming off your meds at some point, I would consider perhaps going to a less potent medication/herb, first. When I became fed-up with the discombobulation of pharmaceutical drugs in the treatment of mental illness, I started self-medicating with marijuana and psychedelics, but eventually I stepped down to a much more mild herb, and now I am poised to step down to nothing or something even milder. Every step, I experienced more progress in samadhi and the spiritual path. When I stepped down off marijuana and psychedelics, I found I didn't yet have enough progress in samadhi to use samadhi as a sole replacement. So the milder herb was a great crutch/stepping stone. Now that samadhi is getting even deeper, I am at a point where, as long as I have the time for samadhi, I should be able to be almost completely clean.