For RSS, there are plenty of open-source options to choose from. Flym is a nice option for android. I personally use newsboat pointed to a terminal browser on my laptop, but that’s mainly due to my focus on text-based news consumption. I’m sure that there are much more traditional options out there.
Interesting - I set up my latest Arch install almost like this. It’s not entirely clear from their splash page whether they update in lockstep with Arch or if they have a Manjaro-like delay process. Is the extra repository just for the Garuda-specific settings apps?