Personally I had zero issues with upgrading my server to Debian 13; it’s an installation dating back to Debian 9 or 10 with a lot of services installed.

The only inconvenience I had was that somehow Transmission 4.1.0 beta made it into debian stable, and beta clients are usually not allowed by private trackers. I switched to deluge and called it a day.

I’d say ffmpeg is a good example, it’s used by almost every piece of software that has to manipulate audio or video (including messaging applications), yet not many people know about its existance.