With multisite, the need to create duplicate MRSS outbound feeds exists for each site. If the site and section for the MRSS feed could be passed in from the request URL, it would eliminate the need to setup individual feeds for each site. A template type feed could be used for all sites and sections.
Outbound Feeds and Arc I/O more broadly will be the future home of MRSS functionality. We'll be sharing customer feedback about MRSS with the Arc I/O team as they build out their roadmap.