E-Mail-- or should that be "Hive-Mail"?-- would be a game-changer for us here. Without using the memo key, using the memo field of a Send TX can be used as Poor Man's E-Mail; it would also be limited (for obvious reasons).
An e-mail system using encrypted memos would put Hive light-years ahead of competitorswhy this hasn't been done yet is a mystery to me.