It is definitely worth looking at. I am working with mostly blog posts RSS feeds, but this might come useful one of these days, too. Thank you for the suggestion.

Exactly. Otherwise, DecSync would be perfect (and I even used DecSync in the past).

Aha, I haven’t thought about using the same Linux application. This approach might be worth investigating. Thank you for the idea.

My only gripe with RSS is the usual dependency on a synchronization server (whether it is a 3rd party server or self-hosted). I have been searching for way too long for a local-first RSS application for both Linux and Android which would store the RSS feeds (as in, the downloaded posts) in a local folder that could be then synchronized between Linux and Android applications using Syncthing or similar. Sadly, still no results. Anyone know about something?

While I disagree with you, this made me chuckle. A great joke. Wish you all the best.

I especially appreciate that the graph is designed as “Linux” and “Other” instead of “Windows”, maybe “MacOS” and “Other”.

You are mistaking KMail (desktop client by KDE) and K-9 Mail (Android client that is being rebranded into Thunderbird for Android).