The idea of prosthetics is a tool. Most people's cell phones are prosthetics. If you leave your cell phone at home, you feel impacted by not having it. It's an important part of your daily function and what you can do in a day.
The programs that have been discussed over the last couple days in the press are secret in the sense that they are classified but they are not secret in the sense that when it comes to phone calls every member of Congress has been briefed on this program. With respect to all these programs the relevant intelligence committees are fully briefed on these programs. These are programs that have been authorized by broad bipartisan majorities repeatedly since 2006.