Good or bad? Facebook adds email addresses

This from the Facebook Blog today:

Today I'm excited to announce the next evolution of Messages. You decide how you want to talk to your friends: via SMS, chat, email or Messages. They will receive your message through whatever medium or device is convenient for them, and you can both have a conversation in real time.  You shouldn't have to remember who prefers IM over email or worry about which technology to use.  Simply choose their name and type a message.

We are also providing an @facebook.com email address to every person on Facebook who wants one.

Now people can share with friends over email, whether they're on Facebook or not. To be clear, Messages is not email. There are no subject lines, no cc, no bcc, and you can send a message by hitting the Enter key. We modeled it more closely to chat and reduced the number of things you need to do to send a message.