Firmware updates can bring users benefits but also risks. An update can bring new functionality, but it can also disable existing functionality. The update process itself can go wrong and crash the device. Users need to be able to make informed choices about whether an update is worthwhile, but at present, the information needed for an informed choice is not easily available to end users.
Specifically, firmware updates come without changelogs. The only way to find out what's in an update is to read about other people's experiences, which can require wading through long discussion threads on talk.maemo.org.
TMO thread: http://talk.maemo.org/showthread.php?p=532356