If almost everything is incomplete, then some things are complete. If there are complete things in a world where most things are incomplete, what is complete about those things that are complete? What is the collection of all things complete and incomplete - is it complete or incomplete? What is the incompleteness referring to of those things that are incomplete? If it is nothing then that which is missing from everything that is incomplete is nothing. So, nothing is missing from that which is incomplete, suggesting quite the opposite. If what is missing, that is, what is referred to by the designation of incomplete, is something, then that something is part of the world of all things that are complete and incomplete. Then the implication is that those missing things that could complete the collection of things incomplete is prevented from completing them.
I think this argument is incomplete.