Re: they kinda missed a trick here?
There is always the DIY approach. I needed a front door camera, so a USB camera now peeks out of the window above the door, and is connected to a Raspberry Pi3 near the door, with a 10" screen attached. The same Pi also fetches pictures from two IP cameras overlooking the front yard and uses Artificial Intelligence (TensorFlow) to recognize, for example, when the Mail has been delivered. It has no reason to connect to the outside world. The new Pi4 is easily capable to do things like this, and speech recognition too.