A fall cleanup is the reverse motion: putting the yard to bed clean before snow buries it. Leaves get raked and removed, spent growth gets cut back, and fence lines and bed edges get tidied so spring has less to undo.
Leaving a leaf layer down all winter is how you end up with smothered, matted grass in April, so the fall visit is less about looks and more about what the lawn wakes up as next year. Everything that comes off the yard leaves with the crew.
Old planters, a broken patio set, the pile behind the shed: if it should not spend a winter outside, the junk trailer can carry it out in the same trip.