The key (ironic) word in this sentence is TIME. A good thief will always access your house if he wants to.
If you add a security layer to your home, a burglar will probably visit another house,
I choose a keyless lock because I avoid with that system key bumper tools. It's another layer of security. That's it and that's enough. I hope that will lead any burglar to the next home available. Not fair for the neighbor, but I want to protect MY home.
And with all the cams around, I'm ok with that without going paranoid.
Btw, the Yale YRD110 uses a 9V battery, like the YRD256.