It would be nice if quotes and paraphrases were always well enough documented to be tracked back to their sources - there are lots of good reasons for wanting that, and most of them have been mentioned.
But we must remember that many DW members are new to both Buddhism and the forum when they join, and we want to make them welcome, not intimidate them with rules they don't understand and haven't got the knowledge to be able to follow. In the early stages, just working out how and where to post was a big enough challenge to me, as it often seems to be for others. So let's encourage
referencing by all means, but let's not talk about making it compulsory.