What you can do with it is pretty much the same thing as what you can do with hived today, the goal isn't to introduce new functionalities, it's to introduce an alternative. Smart contracts is being worked on by the magi team and blocktrades (not right now but it's on the roadmap).

I would recommend not to net sell 100% of DAO money you earn

I hear you, I used to keep a lot of hbd in savings in this account but I don't like to keep everything under one account in case my keys gets stolen and I also don't like to have it under my name. It's pretty easy to google my name and stumble upon my hive account and I'd rather not have a giant dollar sign next to it.