Why does the term "raising" suggest directionality? Consider the sentence
We want him to buy the groceries.
People who describe such sentences often speak of the subject of "he to buy groceries*" being raised to the object position of the matrix clause to yield "We want him etc."
I don't have nearly enough linguistics knowledge to critique such accounts intelligently. I am merely curious about why the above account implies directionality when there aren't any sentences that contain phrases like "he to buy the groceries*".