Recording is the last layer, not the first
A camera tells you what happened after it happened. That matters, but a house that only records is a house that has already been entered. The layers that come before recording are the ones that stop the event, and they are usually cheaper than the ones that document it.
So we design the chain, not the camera. Lighting that responds when somebody lingers at the side gate. A door that locks itself when the house arms. A property that looks occupied while you are away.