Pointing a leaf blower straight at a wall drives debris into door gaps and back at your face. Aim it up the wall a foot or two instead — the backdraft rolls the debris out to where you can get behind it.
Blowing the open surface first and the joints last just re-fills every crack you already cleared with debris from the surface. Blow out the cracks and joints first instead, then finish with the open surface — nothing is left to blow back into a joint you've already done.