I don't expect or want to type in my username every time I unlock my phone. Nor my secure alphanumeric password. Usernames are easy to guess or find out, so in

I don't expect or want to type in my username every time I unlock my phone. Nor my secure alphanumeric password. Usernames are easy to guess or find out, so in that scenario, the fingerprint scanner would go to waste unless you used a weird username.