You can rely on ruby packages being properly packaged? Ahahahaahaha. They package what is necessary for the end user apps (like redmine) that they support, and

You can rely on ruby packages being properly packaged? Ahahahaahaha. They package what is necessary for the end user apps (like redmine) that they support, and a very bare minimum of other gems. Then you are stuck trying to match their release of updated versions with the ones you use. That seldom matches the update speed you will want, for neither ruby versions nor gem versions.