Studies have shown that the first few hours of a game are the most important to convince new players to stay.
So... the new starter zone is not perfect but pretty great imo. one of the better ideas blizzard had.
However after that new starting experience new players come into the main city of their faction.
With the trade channel in their chat window.
And the horrible garbage hot trash boosting spam of doom, on my server there is so much spam that if there was any npc flavor text i would have missed on screen and tried to find in the chat window i would not be able to scroll up fast enough before it get's pushed out of it.
This will give anyone that's not completely oblivious to online gaming a bad taste in their mouth, is this a paid subscription game or some hot asian p2w trash?
If you don't see a problem with this you are a part of the problem.
If you think using addons or exiting the trade chat should be the default for new players in their first few hours, you are a part of the problem.