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We already provide beta builds to the selected members of the community: that is people working on the translations and software developers. There are several reasons why we wouldn't want more people involved, for instance: most users simply do not know how to provide us with useful bug reports and would only waste our time, we don't want the OS to be perceived by people through the beta builds which often contains bugs or things that are not going to end up in a release and finally we usually want to keep infos about upcoming features to ourselves before the release, since this for example gives us the flexibility to delay things.