endorphin The type of software we're working with here will always be under development, one way or another. Keep in mind that Gmail was marked as a "beta" for years after it was made available to an awful lot of people.
There's betas that are marked as beta because the code is still buggy . These tend to have limited release. Then there's betas where the code is pretty stable, but there's some core features that aren't complete yet and where some planned changes might cause significant change. Flarum's the latter type of beta - there's some core features that aren't complete yet, and we know that there's a change planned for the future that will substantially alter some of the basics of how Flarum works currently.
But, having said all that, Flarum's not too far away from a full release and having us working with them is accelerating that progress.