Well, I was just asking because I find most people who defend the Nexus don't actually own one. It's more of a platform wars kind of argument rather than an experience kind of thing. It's quite easy to say "I'm sure it's fine", when it doesn't actually affect you.
However, I have to disagree with you. Unlocking a phone is very much a "security feature" and I'm very confused when people say it isn't, especially on a phone that has NFC for making payments straight out of your bank account. Looking at the setup screens, the phone does warn you that face unlock is less secure than other forms of locking. However, what I want to know is when does the phone say, "Hey, you know, now that you have your $20,000 credit limit discover card attached to me, you really shouldn't be using face unlock anymore". Or perhaps, "Your corporate email server requires that you use an unlock mechanism more secure than face unlock".
I like all platforms, but never owned any of them. I tried out iOS, tried out Windows Phone, tried out Android, watched videos of each, researched all three, even kept up with the news about them. I pretty much know everything for each platform, because I love tech.
iOS is a nice OS, but it's getting a bit boring to me, I'd like to see a new UI or something. But I love Apple's support and the fact that it's so smooth. Android is a nice OS too. It's more customizable, which I like, and has a lot more features than iOS. Windows Phone is a nice OS too, it's pretty original and has a nice UI.
Overall, they're all great platforms, but it depends on the user to which is better for them.
It really depends on what type of unlocking you want. If you want a secure lock, the slide to unlock feature is not secure. If you want a regular lock that will lock the screen for you so that when you put the phone in your pocket, it won't accidentally turn on, then the slide to unlock feature is the lock for it.
Facial unlock is more secure than slide to unlock, but less secure than a passcode lock.
And NFC is highly secure.