RSS client apps can still connect to managed services, so not sure what you are talking about. In my case I'm using Reeder and it's just talking to the Miniflu

RSS client apps can still connect to managed services, so not sure what you are talking about. In my case I'm using Reeder and it's just talking to the Miniflux server. So the server keeps all feeds refreshed all the time and the client app just fetches them from there. Just like Email being fetched from the server over IMAP.