Yeah, this is really the point - reliance on cloud (someone else's computer) for fundamental functionality isn't a good idea.

Glass is going to break before anyone bothers with the lock, so it's not a security device it's a convenience device... but not if you can't use it... and you don't have keys with you...

But, ok, if it's fully locally controlled (HA compatible as you mention), then you're more in control of your own home.