That's true, but can be ameliorated by using organic supplements like 1/8-1/4tsp molasses to promote microbial activity (regeneration), fulvic/humic acids, kelp, fish emulsion, etc.
It's all about balance for most people. Most people don't have time to make their TLO soil. That doesn't mean they have to "let perfection be the enemy of good."
I'm using Grow More Sea Grow. I like it's balance between synthetic (fast-acting) and organic (slow-acting) components. I add Liquid Karma, molasses, fish emulsion. I'm getting good results, no nute burn, no salt build-up (after I learned to watch for it and get my amounts fed correct). The smoke is smoother and richer than when I used purely synthetic GH 3-part.
It works good enough for me weighing the convenience versus "cooking" my own soil, brewing teas, etc.
