I think I saw these on techcrunch or boing boing about 10 years ago. These exist but from what I read, they're only a little more difficult to pick than a regular doorknob. Not good for an outside door, but apparently are just dandy for other types of doors. Inside doors might be OK but would not be a good idea for those with health concerns where you might end up needing to just kick the door off it's hinges to get at someone having a stroke or stopped breathing. Hotel doors this could work. They're always coming up with strange ideas (e.g. Marriott now has an app where guests can check in and unlock their doors from their doors as some don't have knobs at all) ~TMOB
You make some good points.
*Open doors from their phones, not other doors. Yeesh.