If you're so clever, show us your system which does this. Oh, wait, you don't have one, do you?
Actually, I do. It's called my arms.
I really wish people would stop using "brain controlled" for "brain plus millions of dollars of specialized machinery to replace your arms controlled". Saying something is "brain controlled" tells us nothing--it's like calling heavier-than-air flight "massive flight", or fixed-wing aircraft "aerofoil flight". The terminology does nothing to differentiate one thing from another.
While this may seem like a trivially pedantic cavil, it has been my experience that terminology that differentiates on the basis of non-essentials very often ends up misleading laypeople. There is already a robust mythology of disembodied brains as viable objects of philosophic consideration (really) this kind of sloppy language is at the very least not helping.
So can we please start calling these "arms free controllers" or similar, and acknowledge that there is always a brain involved? We're replacing the interface, not introducing a brain. It's like calling a touch-screen machine a "CPU controlled computer" because it lacks a keyboard.