I get that there are websites, videos, write-ups and a training arena, the problem with all of this stuff is you have to dig through years worth of posts to find any information and even if you do find it, there is no guarantee that the information is even valid.
For those that are new, the information needs to be readily available from the moment they sign in for the first time and sadly that's not the case in most instances. As the player base changes so does the method in which you present information, this is a no brainer.
What would be the harm of giving it a go and seeing how it works out?
If the argument is "We already have a TA.", it might be worth evaluating community needs and adjusting accordingly. With new players leaving within 20 minutes of logging in and never returning I would say that that status quo is failing. Don't base this off your experience, look at it through the eyes of those that are leaving so quickly, we have all been playing this game for long time and our opinions can be a bit skewed because we already have a working knowledge of AH.