So true. I just found out in the hard way, by letting the battery in a home safebox expire. I cannot find the physical key and the electronic lock does not work without power. I will have to call some specialists to break in.
As a programmer my day job is "this isn't working the way it's supposed to, lets figure out why and fix it." I can't fathom ever wanting to deal with that stuff when I get off work. A lock and key have been working just fine since the Roman times, it's relatively easy to conceptualize how it works, the things you can troubleshoot on it is a relatively short list, the UX surface area is small and predictable (it's just a lock and a key). I could go on for a long time. If something got along just fine before bluetooth and wifi existed then I never want to own a version that requires bluetooth or wifi.
I have a safe with an electronic lock. The batteries that run that lock are on the *outside* of the secure area. There's a little plate you can slide off and fish out the battery pack. That's how it's supposed to be done.