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My neo-luddite instincts told me to agree with parent, but you make a good point. Copying keys is trivial (I used an automated booth in a pharmacy that was android based the other week, cost like 10 bucks for 3 copies) when having to deal with potentially malicious guests adding complexity to the simple act of locking serves a real purpose.

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My initial reaction on reading this was "Bahahahah stupid smart locks, internet of shit blah blah blah," but I am compelled to agree with your statement. Any lock is merely a deterrent, and adding complexity to a deterrent inherently increases it's security, especially when the threat profile of a door lock is generally "idiot burglar."

For the most part, adding complexity to anything increases the chance of failure. For average people (who don't generally give out their keys) it's not a great idea, but for airbnb hosts, making a key that is hard to copy is a good idea.

However, I've seen some airbnbs that have a pin door code or a key fob, which are arguably more secure than a regular key lock but have less chance of failure in my experience.

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