I used to run a small, closed-registration TT-RSS instance, so I even though I'd already "got" RSS years earlier, that made it so much better.

I'd run a (similarly small and closed-registration) Friendica instance, and used its built-in RSS functionality, but TT-RSS was just so much better for me.

At the time, it even had a mobile client.

I originally dropped it because the main developer stopped doing releases and recommended that people run it from git. To me, that was like being in perpetual beta, and I didn't want to do that.