Microsoft themselves say that using the Kinect is totally optional, except they require you to have it plugged in at all time to use the machine. This is poor thinking, design, & very restricting to users. In the last 30+ years of console gaming, secondary game control peripherals have never been required for a console to actually work. From the NES light gun, to paddles, to guitars, these peripherals were optional & you only needed to use them if you wanted to play a game requiring them. Even the standard controller was never actually necessary for a console to work.
But MS has decided to change that. The Kinect 2 will have to be plugged into your system at all times for your system to work, even if you decided to turn it off its functions in the system. But even then it still has the ability to respond to certain commands. While I am sure MS has good intentions & does not plan on using the device as a surveillance means, there is the opportunity for others to hack the system to use it for such means. And with the recent scares about the NSA & other privacy issues, making such a device required adds to the paranoia.
But one of the biggest issues is in design. Imagine if the radio in you car stopped working, or was stolen, & so your car wouldn't start until it was replaced. Or if your cat chewed through your computer speaker cords & your PC wouldn't boot up. Or you couldn't use a TV at all (no game system, bluray, DVD) because you didn't have cable. Thats what happens if you lose or break your Kinect 2 with XB1. If you have a cat or dog who chews cables you might have to re-buy a $100+ peripheral, that you might never use, just so your system works. If you are on a military base in Afghanistan & it gets dropped, you are now without games until someone can get a replacement mailed from home (not easy or cheap for a group who are already under paid).
We understand MS wants deep market penetration, but theres a difference between forcing you to buy one with each system & requiring it for system functionality. Many of us do not use motion controls or voice controls. Many of us have lived through all of these peripherals. We have tried them out. They are fun for a time but not what we want for most of our games.
Microsoft, please remove the requirement for Kinect to always be plugged into the XBOX1. Give your loyal fan base choice in how we interact with your console.