Bad things do happen. Sometimes an update for one widget/plug-in will fix instabilities with it and the overall WP universe, but create a conflict with another plug-in that you have. Unless the update is critical to fix a serious flaw, cautious people will stay one generation behind the latest update to let others find the conflicts and work out a fix.
It's always good to check the WP forums to see what other users think. If reviews are positive, update one at a time so if something bad happens you know which one caused the problem.