I think it depends on what's in the rest of your mix too - living soil amendments like compost, worm castings, forest hummus, etc. should all have natural myco activity.
Even plain peat moss is home to several myco species from what I've read. Last year I ran a few plants with Pro-mix's myco-supplemented mix and another batch with Lambert non-myco and noticed no difference. I've also added Espoma nutes with and without myco, again no difference.
Lately I'm realizing that a lot of organic gardening advice is not suited to what I do - growing cannabis to flower in relatively small containers (5 gal or less), indoors, as quickly as possible. Usually the plants only live 4 months, and they only spend 8-9 weeks in the flowering soil mix.
Most organic soil advice is aimed at outdoor beds where vegetables and ornamentals are grown by the vast majority of people. Or for larger containers, 15-20 gallons and larger, which is what most people use for vegetable growing, in outdoor crops that spend 6 months in the soil mix.