I think the point is that you're intentionally distancing yourself from them before the interaction even begins.

You're treating them as a threat to your life that interacts through a screen.

I have a camera and doorbell but it doesn't replace the actual interaction, it just means I'm a bit more prepared for who it is and how urgently I need to be there. Zigbee button and a relay switch I can just turn on/off triggered from it.