Hear! Hear! Using a 24-character passphrase that is all lower-case letters and spaces is still more secure than and eight-character monstrosity, mainly for the reason that it's easier to remember (and probably easier to type).
in reply to Re^2: 8-character password limit?
in thread 8-character password limit?
Furthermore, long passphrases are known to be workarounds for known vulnerabilities in security systems. Passphrases 20 characters or longer are significantly harder to crack in WPA-PSK. Passphrases longer than 14 characters have no LANMAN has in Windows (MUCH MUCH harder to crack).
Enforcing a larger minimum length is more important than making stern complexity requirements.
Simple proof: You care how long your encryption keys are, not how complex they are.