TechnologyRising costs and component shortages lead some brands to slash outlook by up to 30%Smartphones on display at a Xiaomi retail shop in Beijing on March 16. Several Chinese handset makers are lowering shipment targets this year. (Photo by Tomoki Mera)TAIPEI -- Major Chinese smartphone makers including Xiaomi, Oppo and Vivo have told suppliers they will again cut shipment targets for this year -- some by up to 30% -- as rising costs and unprecedented component shortages continue to weigh h...