The
Trader Tracking list is not just for when you trade with certain traders, it is supposed to list any trade made with a trader who has a rating under 15. Some traders don't know about it or use it but it can be used by everyone, including two traders with under 15 ratings doing a trade with each other. The list was started after this
trader had a ton of trades going at once while having a relatively low rating. If this list had existed sooner, the number of pending trades with this user would have been a hint something is up, and maybe some of their later trades would not have been arranged.
I hope you don't think me using the trader tracking list is an indication that I don't trust newer traders. I have nothing against newer traders and never hesitate to trade with someone with a 0 rating, and rarely ask for them to send theirs first (only large trades involving FPCs). No one ever asked me to send my side first when I was new so I don't ask either. I just use the list because a trader doing 3 or 4 trades at once is no big deal, but a newer trader with 20 trades, half of which were made more than three weeks ago, is not a good sign. There is no other way to let others know you are waiting on someone's trade since most people wouldn't post in this thread or leave a visitor message about a trade made only two or three weeks ago. Without the list that trader could still be making more trades because no one has left them a negative rating yet. It's not perfect because too few traders use it, but it's better than nothing. Of course this risk is still present with more established traders but hopefully not as high.
On the topic of leaving trade ratings, I agree it is frustrating when someone does not leave feedback, especially when you are newer and trying to build a reputation. Personally, I believe leaving a trade rating is part of making a trade with someone, and if the trade was as I expected, then I leave a positive and hope the other person will too. I open my mail in front of my computer so I can check to make sure I got what I was expecting and I leave a rating right then.
There are some traders who just don't like to leave feedback or let you know if they've received your trade, and I just no longer trade with them. If they've ignored my last 2 PMs asking whether they've received the trade, I don't know why they would expect me to answer their PM asking to trade. I do, of course, I'm not that petty, but I decline to trade again.