RSS is actually one of my favourite uses for the tablet; I built a little service that builds a pdf "newspaper" twice daily and sends it to Google Drive. Very nice to read my feeds on the rM2 instead of a glowing screen
Its development kinda stalled, with several PRs stuck at 90% completion.
I'm using reMarkable 2 as an e-book reader, using KoReader. It's almost perfect for me, the only thing that I'm missing is Bluetooth. And its WiFi is sometimes a bit flakey.
There's also a UI frontend for the package manager in beta.
Netsurf isn't fun on many websites but it should be enough for rendering HTML content from RSS, no? Terminal emulators and lynx/elinks/links/w3c work, too. And terminal RSS readers. HTML rendering is also possible with KOreader which runs well on rM2, come to think about it.
Here is the repo for netsurf https://github.com/alex0809/netsurf-reMarkable