I understand your healthy skepticism, but without powerleveling, as someone that's intimately familiar with MAPS, their protocols, and the medicines talked about, I assure you that the use they make of those substances is the closer to "without bad side effect" than most prescribed drugs out there.
There are quack ketamine clinics out there, but MAPS is the best of the best. When they finalize their drug use authorization with the DEA, I assure you that MDMA-assisted therapy will be a huge boon for a lot of people.
MDMA ends up being the first of schedule drugs that they are pushing through (because of the incredible results it has on traumatized vets, the DoD is telling the DEA to let the drug through for the sake of the VA), but originally MAPS worked with psychedelics, tryptamines and lysergamides, and I think when psilocybin will be allowed as well it will help a lot of people and harm the SSRI industry.