While I’m a huge fan of the new Control Center on iOS, I can see where it might not be the best thing to have enabled on the lock screen. We’ve all left our iPhone or iPad out in places where folks might be able to get a hold of it, and you might not want those folks messing about with your settings.
Once you take Control Center out of your Lock Screen, you’ll have to enter your password (or use Touch ID) to authenticate to your phone before you can use Control Center, which is a pain, but so will anyone else, making your device just that much more secure.