Closed Beta, specifically Founders Beta, is an exclusive time that does not allow everyone (those who are not invited) to participate on equal terms. This would create an upset for the players who do not have the chance to join in these times and also make competitive play unfair. In addition to this, Closed Beta is for testing; items are often given out randomly and in large numbers to test them. This should also mean that leveling should be done for the sake of testing. These items tend to be unfair or "OP" in terms of competitive game-play and would not be fair for those who did not receive the items in Open Beta onwards. Finally, in addition to the above, the Closed Beta Wipe is something that is quite standard in Aeria's CBTs. I wouldn't expect them to change this policy for Aura Kingdom.
Luckily for you all in Founders, you will not have to fight for your name once Open Beta hits. However, I wouldn't expect much more than that.