FFXIV last beta phase should have just been called "early-early-access". It was so close to the launch date (ten days before launch ), it was basically meaningless to "beta test" anything other than to stress the servers, and even then the same server and login issues are still present right now.
Any modern MMO right now will offer early-access with no roll-backs to entice the hardcore fans and boost preorder sales. But anything earlier for a non-rollback would be unfair to everyone because of such a huge headstart.