1. A number of early customers we've spoken with don't like the idea of an always listening device. The perception is an invasion of privacy.
2. There's a fear that someone outside the home could simply yell a command like "unlock the doors" to gain access. There are a number of ways one could solve this, but it's a fear we've heard about.
So the extra friction of taking out your phone and pressing a button so far seems worth the added layer of privacy and security, but we're definitely thinking hard about this one.