I certainly agree that the new message board is a disaster. Some of my messages, such as one recently about UGG sales in Japan, simply did not appear when I try to post them. This of course deters me from trying to post messages.
Also, some messages by others are listed, such as one a little while ago that supposedly appeared 12 minutes earlier, but the message is actually not there.
I complained to Yahoo! when they were soliciting comments on the new system, but of course they undoubtedly ignore such comments.