For better or worse, I have a large window on my front door. (OK, a little back story: My wife wanted a big window on the door to see the marsh across the road. I reluctantly agreed on the stipulation I would personally build the door. So, the door is secure. Steel reinforced that looks like normal oak. The window is STRONGER than the door itself. It cost over 500 dollars for the window alone. Triple layer laminated shatter, impact, bullet, sound, resistant insulated glass) The jambs are the real weak point but I reinforced those too. Then there are the easily accessible windows on the porch.....yeah, true physical security is pretty hard. We have curtains over our windows and really dont have much valuable stuff. They can have the 32" Vizio that is 12 years old. My gun collection is small and easily replaceable.
So, it is easy to ID anyone at my door.
When someone knocks, I am known to hustle across the hallway from living room to bedroom to ID the person at the door and then pull my gun or not from my holster and answer the door with the gun behind my back. I have a special chain that is extra thick and shorter than usual. Maybe not the most secure but it makes me comfortable.