What is the benefit ? Sharing thoughts to the external world would be like going to a bakery and walking out with flour and eggs. Isn't the act of talking/writing part of the thinking ? Am I just going to share intrusive thoughts and half-baked ideas to my CIA agent now ?

I can see legit use cases where people simply can't communicate in any physical way. People with locked-in syndrome, etc.

But, obviously those only make up a small number of people.

Strapping a mind-reading machine onto some detainee is probably the more likely case.

This might be naive, but I think the idea is to replace your keyboard