You need a brain to function.... If you didn't you would be dead!......As in never exist.....Duh!obviously you don't have one.
Your brain is the control centre of your body. It controls everything you do - it makes your heart beat and your muscles move. Your eye's and ears send signals to your brain and it interprets these...
Everything.
Of coarse!
I think there are no disadvantages on it. HMI is very good and very useful nowadays.