Think of how many people are on SSRIs that have mixed effectiveness, side-effects, and have to be taken daily. Then compare that with a treatment that you do once a month and whose main side-effect is a heightened sense of empathy. Even if it doesn't permanently get rid of depression and anxiety, and solve all of your underlying problems it's still a big step forward relative to the current state-of-the-art treatments.
I can speak to how nice it is to just feel fine for a while and get some respite from a constant feeling of fear and anxiety at everything. It's a world of difference, and could easily be the difference between someone not even being able to get out of bed, and actually taking a crack at doing things.