I think this is important - growing orchids organically . meaning using an organic feed.Fresason - see below - Unfortunately there are not many to choose from - at least here in UK. I discount using animal manures to make my own . The only ones I have found come from The Netherlands, and are made by the same firm that makes gro-bags ( which I use in an unheated greenhouse, for my tomatoes . They actually have a range of different ones. After looking at the analysis, and trying out a small bottle to check the pH, I have settled on the one they make for ericacous plants - rhodedendrons etc. Even then ( of course) I have to adjust the pH and Ec to suit orchids, rather than following their general gardening prescription.
As to the importance , I showed in my research, published in various places several years ago, that epiphytic orchids get their food "pre-digested" as you might say, since it is actually plant sap ( exuded from the plants they are growing on) and diluted by the rain. So whilst a terrestrial; may get inorganic chemicals from the sloil, epiphytes get the diluted sap - which of course, is organic. Mahybe they can handle this much better than giving them disso;ved inorganic stuff - its a fair guess, anyway.