Retail media may be the fast-rising star among advertising channels, but too many brands remain fixated on ROAS as the single metric. There are several reasons, starting with a tight economy, but a lack of technological sophistication is also a problem for many brands, according to panelists at an IAB event last week which included Roger Dunn, global head, retail media & performance media, Diageo, Hope Williams, head of ecommerce at Kinesso, and Andy Ford, head of data intelligence and measurement for Coles360.