Since adb rarely comes up on Hacker News, I got only one shot to ask how other Android uses deal with the problem of freeing up disk space without rooting the device or doing a factory reset? The number of apps is not the problem. Some apps or the OS must be filling directories with inaccessible temporary files or perhaps the OS is keeping all its old updates somewhere? On a 32M device 15 megs is lost over the course of a year. All the obvious user space tooling cannot clear or access it.