We are becoming increasingly aware that Entertainment OS, Comcast’s technology stack which powers all of its cherished products and syndication partners like Australian Foxtel and South African MultiChoice, is slowly but surely distancing itself from RDK (Reference Development Kit), the middleware foundation on which the entire tech stack was built on. First we noticed the absence of any RDK mention during a marketing presentation at the recent CTV World Summit—a surprise given Comcast is one of the founders of RDK along with Liberty Global—and there is now an uncomfortable silence around the Xumo streaming dongle’s most recent deployment. Mediacom, the fifth largest cable operator in the United States, has become the third operator to deploy the Xumo Stream Box, after…