LoveGrowingIt
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It has to do with uptake of nutrients. Microorganisms in the soil known as mycorrhizae are fungi that have a symbiotic relationship with the roots of the plants. They're common in nature, but I believe most of us use commercially bred types. The symbiotic relationship means the fungi feed to plants and the plants support the fungi. This is why organic growers are mostly unconcerned with pH. Contrast that with synthetic nutrients that the roots uptake directly, which requires a specific soil pH range of about 5.8 to 6.2. This difference often causes confusion.
There isn't a definite soil recipe for organic growing. I started with Fox Farm soil but amend it with other ingredients every time I mix it. By now, it's well composted. I add things like earthworm castings, biochar, azomite, Epsom Salt and gypsum. I also use Gaia Green dry nutrients. I also use perlite and rice hulls for porosity.
I think the best thing about organic growing is how forgiving it is. I've described some of what I do. Others successfully do it differently. If you're interested in learning more, I suggest starting a thread about it. I'm not the only organic grower here.
Indeed. As a general rule, it's a bad idea to bring anything from the outside into our inside grow space.