Some people like the pH balancing properties of soil, it just 'works' for their situation.
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Why does it bother you is the real question...
It's my understanding that chem nutes can make the plant grow faster and yield more....however you are just giving the plant a handful of specific nutrients and missing out on a lot of other complex micronutrients/microbes/enzymes that are available in soil.
So why not get the best of both worlds and amend a nice soil mixture with a little chemically derived boost from time to time? Really, I don't see how it's so hard to understand.