The "dictionary attacks" sentence is a non sequitur. The number of possible eight-word Diceware passwords is within an order of magnitude of the number of possible 16-character line noise passwords.
You're right, removed it. I'm not sure I understand why people prefer using passphrases though. Isn't it incredibly annoying to type them over and over again?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.