I'm only going to start with electronic keycard access. For me, being able to replace big, sharp keys with small, smooth cards/discs of plastic is a big win.

I'm only going to start with electronic keycard access. For me, being able to replace big, sharp keys with small, smooth cards/discs of plastic is a big win. No fiddling with my keychain, just walk up to the door, press my wallet/keychain/pocket to the door and tap. I want that convenience, without having to sacrifice security (which is the case with all such consumer locks I found). Calling that a smart lock is a bit of a stretch. Keycard access is old school, but was only used in commercial settings until recently. It's just that the consumer market has dubbed anything that isn't a plain mechanical lock a "smart" lock when applied to people's homes. Internet connectivity would be something I add later. I'm not as motivated to put the device online, as the benefits as you listed them are a bit fringe for me. Assuming I complete this project it will certainly get open sourced, so perhaps other users will motivate the addition of such features.