Absolutely. I've tried to "sign up with Facebook" about five times, and four of those times, after "signing up" it asked me to enter my email, create a username

Absolutely. I've tried to "sign up with Facebook" about five times, and four of those times, after "signing up" it asked me to enter my email, create a username & password, and fill in my first and last name. I was optimistic that the pattern would change, but now I completely avoid using any external Facebook account integration.