Personally, I think that - with the exception of some true terrestrials - ALL orchid growing is hydroponic in nature, and that essentially all of the nutrition must come from the fertigation solutions we apply
The plants really get no nutrition from the potting medium; it is present for mechanical stability and moisture-holding. In order for the minimal amount of nutrient value to be released, the medium has to be decomposing, and if it gets that far, it'll become compact and suffocate the roots.
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