Mut zur Lücke — courage to leave a gap. Students say it before an exam, when they decide not to learn everything. At work it means accepting an incomplete solution on purpose.
die Goldrandlösung — the gold-rimmed solution. It is a critical word for a solution made perfect at any cost. It is often used in the debate about slow equipment purchases for the Bundeswehr.
The first phrase asks for courage, which shows that completeness is the normal expectation.