a precise mix is actually what you want, you dont want to be running something that you dont know how to dose because it comes different everytime.
you were doing good up until the mycos give em superpowers part. they are just like any other additive theyll only push them so far as well, and with salts, or chlorinated water your not doing anything by adding the mycos or beneficials cause that shit just kills them
seriously where are you guys coming up with this shit? oaksterdam needs to get some quality teachers
first off, define "precise mix". Precise based on what? What is needed in the soil at hand? Some arbitrary ratio? Total volum? Mass? Makes no sense to call premixed nutes precision anything unless you are doing hydro.
Second, not to condescend, but do some research. Tap water is not a problem for mycorhizzae in most cases. And you don't seem to know what they are. Not all mycos are root symbiotes, and the mycrrhizal fungi do indeed trade super powers for a bit of sugar. I kid you not. Nature is fascinating. Want to see some crazy superpowers from fungal interaction? Check out the corpse flower. It's like an undead plant, and its super power is the ability to grow without photosynthesis. For mj, the super duper power is the ability to make tons of flowers with barely any phosphorous. You can see how such a SUPER POWER would help one species outcompete another. Nature. Check it out.
For your last point, let's discuss the science, not our backgrounds. I
not that interesting man. The topic at hand is much more fascinating.