There's no hidden knowledge or special secrets you learn about life from psychadelics. It can give you persistent/permanent hallucination disdorders.
In fact I recommend staying away from them and focusing reality-- improving yourself, your community, building something useful/interesting, etc.
If you do choose to waste your time and do psychadelics: Be very careful. Don't overdo it.
No, but in a time of significant grief, psychadelics allowed me to process it in a completely different way. I made more progress in 6 hours than I'd made in 4 years with 2 of those in therapy. There's no deep universal truths to uncover, but depending on your mental health, there may be some deep personal blockages that can be... sidestepped?
I used recreationally a few times as well. Mixed results there, including one that sent me on a tailspin for a few months. Absolutely, use with care, with a good sitter, and mind your set and setting.
However, they can provide a world of good to the psyche as well, I will attest to that, and the changes I made from them might never have occurred otherwise.
There are very different kinds of psychedelics with different effects as well. Blanket statements/policies for all of them should consider that.
I understand what experienced psychonauts mean when they say that, but it is an incredibly useless and condescending thing to say to somebody who went in unprepared and was traumatized by the experience.
Imagine someone was complaining that nobody should ever drive cars because they were injured in a crash after having a go at it without licence nor experience.