The issue with RSS on my e-reader is 1. the amount of feeds I'm subscribed to and 2. I'm often using my e-reader when I'm offline.
1. is not an issue on my computer/smartphone as I can scroll through the feeds and go through interesting links quickly, the keybindings help me do that quickly.
2. Can either be fixed by downloading all links when online (not practical in my case), or by picking and choosing which articles I want to read later.
I used to use Wallabag for this, but right now my setup is a self-hosted Readeck [0] instance with the associated KOReader plugin [1].
I really like Readeck because contrary to Wallaback (which I also used because there is a KOReader plugin for it) it captures the content from a page from the client-side through the browser extension [2]. That helps with paywalled articles which don't expose the full feed through RSS typically.
[0] https://codeberg.org/readeck/readeck