Nowhere in what you quoted is it ever stated that Shamans are better tanks. Anywhere. What the f are you reading? Shines tenfold? “But this is reliant on personal and guild experience”.
“statistics won’t reach a warriors”.
Never once it is stated that Shamans make great tanks. He’s stating that it can work when the player and their group put in extra effort.
Your bizarre agenda paints everything you read into something that simply doesn’t exist.