A lot of those findings are largely from clinical settings and may not fully reflect the results seen in non-clinical settings (i.e., there might be more variability when it comes to its effectiveness at treating depression). Shrooms and psychedelics in general are not a magical cure for mental health issues, and, in some cases, they can also worsen them. You shouldn't just start self-medicating, especially on a substance whose effects can vary a lot depending on your environment and headspace.
My first trip on shrooms was actually quite horrible and involved a lot of mood swings and a lot of disorientation. For reference, I'm not even mentally ill, rather, I was just in a rough patch mentally back then. If it weren't for the fact that I was in a self-destructive phase at the time and was looking for things that could cause me pain, I probably would not have done them again. I won't lie and say that they didn't help, because they did once I started to get the hang of tripping, and I haven't really had any bad or rough trips outside of the first two times I tried them. At the same time, I can easily imagine someone who is mentally ill and is currently having a rough time coping with their mental illness finding themselves going through a horrible trip (one worse, my first one) and coming out of it traumatized. That is not even getting into the potential risks that come from psychedelic use for those who have or who have a family history of schizophrenia, or just issues with psychosis in general. Psychedelics can also cause things like thought loops, which can have a detrimental impact on your mental health.
While I don't mind people using them recreationally (hell, that is what I use them for), I wouldn't recommend using them to self-medicate. It's probably better to look into doing psychedelic-assisted therapy instead.