"dry out soil enough and water will run off it like concrete" means "If you dry out soil enough then water will run off it like concrete", yes.
I suppose you can phrase it generically like X&Y, but the Y and probably also the X need some features to fit into this "if x then y" interpretation. Usually, the phrase in place of Y will include a word like "will" or "going to". I wouldn't know how to stipulate the exact conditions where this phrase can be interpreted this way though, sorry.
I've realized that you're focusing on who is accomplishing the task, I didn't really understand that before. The "You" in "If you dry out..." can be seen as an abstract "you", not actually referring to a real person doing something. "If you went to the center of jupiter, you would find that the gravity is bone-crushingly powerful" -- this isn't saying anything about an actual human who can actually travel to the center of jupiter, it's meant more to be a statement about the center of jupiter. The "you" is abstract/hypothetical - it doesn't have to be remotely possible for a person.`