Probably the most significant innovation in smart home technology is the advancement in safety and security. 

The smart doorbell cams send notifications via Smart Phone or Personal Assistant (Like Alexa) that someone is approaching your door. At a preset distance, the smart doorbell starts recording (and storing) the video and audio on the front door activity. From inside the home or remotely you can see who's there, talk to them and even unlock the door should you decide to (assuming you utilize a Smart door locking system).

Smart locks allow you to lock/unlock doors verbally (with Alexa) when your home and via smartphone remotely or from outside if you've forgotten your keys.

Smart Garage doors allow you to open/close the doors from your phone and will notify you when the door goes up or down and what time. Automation can be set notify you should the garage door stays open for a specific period of time.

Smart lighting automation can turn on/off lights in the home while you're away providing the appearance someone is home.

Smart Cameras can be deployed in other areas and will start recording on per programmed sensing tolerances.