Thank you! I was considering creating an account with email+password, but I wanted to reduce the cognitive load on both sides. The consumer side of having to remember passwords (made somewhat moot by the iOS keychain auto-suggesting strong passwords). And the implementation side (since I'm just 1 engineer) getting tricky of saving passwords securely and handling that flow.
Having said that, if there is more interest in having email+password accounts, I'm more than happy to look into it, but it would have to wait for a later version.