I don't think I want Debian changing their packaging policies so some random Retroarch contributor can break my app (or worse, losing my data) by pushing a bad update. I want Debian to be a rock-solid OS where nothing breaks even if it means old software versions, because adults are doing QC.

If I need a specific app to always be up to date, I can get it from external sources on a case-by-case basis, such as downloading an AppImage/Flatpack from the developer's website or using Docker.

Why wouldn't you want a rolling distro if you want everything updated all the time?