This is wrong. You can absolutely dose psylocybin at levels that make a meaningful difference in experience (certainly enough to have an anti-depressant effect) without “tripping” or being in any way impaired. For many adults, this will be around 100-200mg of psilocybin.
Microgram, not milligram, of psilocybin. 100mg of psilocybin would be about 50-200 grams of dried cubensis mushroom.
There have been studies on microdosing, but it’s also valuable to know what happens at perceptible doses as well. It’s certainly a different experience.