You make good points and I will concede on those, but I also still think logs should be posted whenever possible if a raid is asking for help. The OP is putting up a list of important things to put in a "help me" post in order to get the best responses, and on that criteria, logs belong on the list.
If they don't know how to read the guides --and they can be very confusing at first -- I don't think the right solution is to avoid encouraging them lest they just rely on getting their hand held. There's no reason we can't help people by aiding with their raid issues AND teaching them how to make use of the tool themselves. The people who like helping out could post links to the WoL tutorials or at the least say "I noticed from the logs that the reason you're wiping is that your curses aren't getting dispelled. Here is how I figured that out using the log so you will know for next time."