I don't think the changes in Android 11 are catastrophic. I'm using Syncthing on Android 11, and Syncthing can read/write to any directory in the filesystem und

I don't think the changes in Android 11 are catastrophic. I'm using Syncthing on Android 11, and Syncthing can read/write to any directory in the filesystem under /sdcard, with the exception of the /sdcard/Android/data directory (private app data). Syncthing does request the "All files access" permission that gives it access to most of the filesystem. I'm not sure about external SD cards, though, since I haven't tested this.