question about region assignment upon re-enable table

[Liu, Raymond]

Hi

        I am just curious about the region assignment strategy upon table 
re-enabling. 
        By default, it's random assigned to the region server. I checked jira 
and found HBASE-6143 suggest to make it smarter like take load balancing into 
account.
        While, I am wondering what prevent it from using the retain assignment 
strategy as in the case that a hbase cluster is restarting? Is there any reason 
that we cannot use the previous region assignments in META table?

Best Regards,
Raymond Liu