You will lost out on creating automations based on motion from HomeKit cameras. For example, front yard camera senses motion at 3 am, turn on porch lights (and HomeKit enabled sprinkler if you want to get those pesky animals off your lawn lol). Another cool feature of HomeKit cameras is that when you stream a camera from HomeKit, you get a button right there on the screen that will allow you to turn on lights, lock a door, deactivate the alarm, etc. within that cameras assigned room without having to leave the stream. Very handy if you get a motion alert in the middle of the night in a room that’s dark and shouldn’t have any motion in it at that time.