I spent the last week and a half porting @brentsimmons's NetNewsWire and it's Swift codebase to Rust and GTK / Gnome. It is 90% functioning on Linux.
There's a few things left to add (like the ability to ADD a new feed LOL. I'm working off of an OPML file that I got from the mobile version of NetNewsWire) but it's fairly complete.
I wasn't happy with any of the RSS readers on Linux and wanted what I knew best.
Currently the git is still private until I'm 100% happy with it. Almost!