What up BigSarge, I was gunna use your initials (BS) ooops  ! Lowenfield definitely knows his stuff . I've got a couple of his books, but my experience with organic soils is patience, patience, and more patience. Microbes, bacteria, and fungi take some time to do their thing, especially when you're first gettin started. I'm talkin 3-4 months. Organic soils truly do get better with time, if you maintain them correctly. Don't forget the BIOCHAR, it will help sustain the microbes and ensure productive soils. Here's a little research I found on PH'ing with Phosphoric acid . Peace...  3% phosphoric acid puts microbes into a dormant state. This is the amount added to fish hydrolysate to stabilize it for storage. This amount does not kill 'all' of the microbes but it must be thoroughly diluted before adding to soil without doing damage. So, when you use lesser amounts, you are likely not doing a great deal of damage microbially. As for doing something because commercial farmers do it....well they have been doing stupid things for years.....unless you were referring to commercial organics? What are the good results? and why are they using it?

I myself would only use it for putting microbes to sleep. I'm not into the pH manipulation thing, but I don't see that minor amounts are worse than anything else which manipulates pH. (bacteria = towards alkaline: fungi = towards acidic)