That’s what they say: Art is never truly finished, only abandoned.
Most movies aren’t generally considered art to mainstream folk* but the sentiment still applies.
The idea is that at some point, the amount of effort put into improving or making a piece of art (or movie) better, outweighs how much it will be improved. It becomes inefficient and not worth the time to continue “tinkering”.

Athenon confers with the Oracle.





