I am calculating the differences between graduated betas v.s. discontinued betas for an academic paper. A key influencer on this is the process that is followed within Area 51.
Back in March 2010, a comprehensive post explained the process by which a beta site goes from proposal to graduated site: Area 51 > Private Beta > Public Beta > Graduated Site.
With the passage of time, it appears the comprehensive post no longer accurately reflects the process undertaken. It appears there were various views on the utility of the private beta stage. The Area 51 FAQ makes no reference to private betas. The Area 51 proposal page lists the phases as Define > Commit > Public Beta. I have attempted to locate any public announcement but it seems none was made?
Am I correct in my understanding that private betas have been discontinued? If so, why so and what was the policy change date? Is it possible to identify which sites went through the former process of having a private beta and those which went through the new policy of not having a private beta stage?