Decades ago, the creative and media sides of the business split. But in the world of digital marketing, digital agencies, which dominate Adweek’s annual Fastest Growing Agencies, have owned every step of the process. They oversee content ideation, production and deployment. In 2022, convergence is coming to all aspects of marketing, not just digital. Brands will increasingly look to remarry creative and media, either through consolidation within holding companies or with independent agencies that can execute both capabilities. In today’s multichannel world, creative and media must work together to make media dollars go further. In Adweek’s recounting of the 10 most notable creative and media accounts to change hands in 2021, four were consolidations into a single holding company: Coca-Cola with WPP, and Mercedes-Benz, Philips and Home Depot with Omnicom.…