That the evidence suggests that they are not much more effective than placebo and that the difficulty in stopping them and the extent of the associated withdrawal symptoms have been downplayed by the drug companies and the medical profession for decades.
But placebos are known to be effective in influencing the brain. So if the issue you're trying to treat is psychological, does it matter whether it's the actual drug or it's associated placebo effect that's causing you to feel better?
I know you've also highlighted the difficulties with coming off of the meds, but if the main concern with staying on them is that they're no more effective than a placebo (which you can't replicate easily on your own outside of a blind study), then why would you want to come off of them?
I haven't watched the documentary so obviously if there's some long-term detriment that outweighs the benefits of the drugs, then clearly that might be a reason to consider stopping.
But if it's just because they're no more effective than a placebo, then that seems like an odd reason to think they're not worth taking, since placebos have been shown to be very effective psychologically.
Placebos are known to be more effective than nothing in many cases, so if the meds are as effective as placebos, why would you want to drop down to nothing, which is less effective than either placebos or the meds?