It's not that complicated really. New version debuts in open beta, once it is classified stable, it moves to stable branch and supersedes the old stable version.
You can’t even see the irony of a ‘stable’ release in name only that is an unoptimised piece of crap.......and two weeks later is amazingly back in open beta.
ED have just manufactured a baseline for themselves in order to create the illusion of progress and functionality. The gullible just lap it up and claim this is how software development is undertaken.
On the Eighth day God created Paratroopers and the Devil stood to attention.