Analyzing Word Choice in Context

Read the following passage carefully:

Despite their popularity in modern kitchens, nonstick pans have faced scrutiny for their long-term safety. Once heralded as a revolutionary kitchen aid, there are increasing concerns regarding their chemical composition and potential health risks. Some experts argue that the convenience of easy cooking and cleaning outweighs these concerns, while others advocate for traditional cookware made from stainless steel or cast iron, emphasizing durability and health benefits.

Based on this passage, what is the primary connotation of the word 'heralded' as used in the context?