With truffles at least it’s because those conditions aren’t actually well understood and the timescales are long so it’s very difficult to brute force through a trial and error approach. It’s not just about specific light level, temperature or even specific nutrient availability as with many things, that has been tried and failed. It seems to function symbiotically with various surrounding life forms, definitely trees but maybe more like soil bacteria or other fungi, and it takes time for the fungus to build infrastructure before it starts producing the bits we like to eat. Over that time it is exposed to a variety of environmental conditions. Which other organisms and which conditions are necessary and which are noise is not fully understood.
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