I think this is an odd question. Here are some immediate logica for our delectation.
What do we mean by complete? ?...........No loose ends? No gaps? No degradation? No growth?
If the universe is complete, always was, and necessarily always will be ?.. then there is a universal sense in which the universe does not change and therefore does not grow. Its birth and death, if it had any, must be instantaneous since growth and decay imply incompleteness. Change is not the same as growth, but non changing completeness is a lack of growth even in a generally changing universe.
What do we mean by incomplete? ?...... Faults. Inconsistency. Missing elements. Lost elements.
If the universe isn't complete, never was and never will be ?... then something will always be missing somewhere. But such a universe does hold the possibility growth, by virtue of its incompleteness. In fact such a universe even holds the possibility of limitless growth..... but never to the point of completion.
I think there may be a real philosophical dilemma here.
Option A - If we choose to believe in the complete universe, then it is delusion (presumably by our human incompleteness), to believe that anything
truly grows and decays ?.. including ourselves. Change is now completeness changing. Our actions neither add to or take away from the completeness of the universe, even though we apparently grow from a relativistic perspective.
Option B - On the other hand to choose to believe in an incomplete universe doesn't feel right. There is something missing and will always be missing. Or maybe that does feel right....... and just downright uncomfortable!
Suppose you consider the above two options as presenting an undesirable hobson's choice.
Option C - A third possibility is that the universe starts out incomplete and then becomes complete by creating or finding what was missing..... And
at that point will cease to grow. Wanna live in the universe beyond that point? No growth, just change. Back to option A. No? ?...... Then presumably you don't consider what is missing as something you want to add to the universe to make it complete. Ie such a view would give you a feeling of
Guilt because you neither want to live in a complete universe or worse still, create it
.
Option D - But suppose the universe started out as complete, then became incomplete forever. If we live in the incompleteness stage we are able to believe in
personal growth while living without fear of the universe ever becoming complete. Moreover in the context of
'the fall' from completeness we may even experience at times that divine element which started to go missing,
without guilt..... Is this therefore the most attractive option for human beings to believe in?
(How about the following addition ?... as a kind of recompense to the universe for taking such a negative overall view, purely for our own benefit and need for personal growth, we can even graciously believe that it was people of the past that caused the incompleteness in the first place! This quality of humanity simultaneously guards us from living in a complete universe on the one hand, and moreover the guilt is not out of our choosing ?...... but our nature.)
any other metaphysical tricks we might use in the context of the completeness of the universe?