Some people like doing chemistry, and like having the exact amount of material to dose every single time. I am not one of these people. For substances like cacti I prefer the art of improvisation. I never got much out of eating some pure mescaline compared to drinking many feet of cactus down to a cup and just drinking it. I like not knowing, not expecting what is coming. It could be light it could be strong but it's ALWAYS medicine. I personally get more out of my material by doing it this way, your mileage may vary. I often see people who once extracted moving on to teas / resins for the full spectrum effects, simplicity, and potency.
The reason I became this way was due to many experiments, which I of course advise everybody to conduct to see where they stand on all of this.