Do you mean there is a unified feed that list all new entries in my subscribed channels? Or that one need to add a seperate rss-feed for every followed channel?
I only know the second option, and it kinda sucks to maintain multiple places. Would be really great to have just one place to to that.
1 - If you are on mobile app, subscribe to the channel on youtube. Them every few days, check your subscriptions on YT and add them on your RSS reader, while unsubscribing from YT.
2 - On desktop, many RSS readers have extensions to follow the current page, so you could use an extension to subscribe. Some mobile apps might let you share a link to it, and them subscribe there.
The inconvenient thing about that is, it could be more cumbersome if for example, you sit on your couch and want to just cast some video to the TV. On a RSS reader you might need to click the link, which will open on YT app, and then cast.
Will have to check that, that'd be great.
I don't think there's an rss feed for "a selection of new things that youtube expects that you would actually watch, from the channels you follow, which youtube would list on the main page or whatever for you", so you can get exactly the same things,
but if you just want to subscribe-through-rss to all the channels you subscribe-through-youtube , you can.
You can also subscribe to a youtube playlist, if a channel has a playlist you are interested in, but which is only a minority of their videos.