Why Did Airbus Build The A380 Without Winglets?

While modern widebody aircraft like the A330neo, A350, Boeing 787, and Boeing 777X use sleek blended or raked wingtips, the Airbus A380 Superjumbo instead uses fenced wingtips found on the Airbus A320ceo. But why? Why didn’t Airbus engineers design the massive aircraft with sleek blended wingtips, and instead go for the older design Airbus first used in the 1980s?