Beezer, you're both right and wrong. The quote function is something that can be toggled on or off (it's an admin option).
It became a problem on this board, inasmuch as members would quote an entire post, some of which were (and are) quite lengthy - only to respond to one small point of the post. People wouldn't self police, by editing out everything except the point they wanted to respond to.
The Staff finally responded by taking that feature away.