I've noticed the lack of precise data in the wiki for quite some time and have been performing tests in the Mists to fill in the gaps. However, I've not been updating the wiki to reflect what I've learned. This is a problem. It doesn't help others or repay those who have updated the wiki and over time I might even forget the results of my tests myself.
BTW, I'm going to try to include dates in the actual wiki text rather than rely on the automatic update tracking. The skills in this game are a moving target and it's just not useful to require everyone to drill down to the update history every time they read a page to determine if any given details about a skill are perhaps out of date.