I don't know what you mean by this. I understand that SHA2 is poor for some things, but I'm not sure how this illustrates that. You want password hashes

I don't know what you mean by this. I understand that SHA2 is poor for some things, but I'm not sure how this illustrates that. You want password hashes to be very slow, (and to use a lot of RAM) to make brute force attacks difficult. SHA2 is fast, and having hardware support makes it even faster. This makes it a bad choice for a password hash.