Why shouldn't it be mainland-centric? Mainland China is 99.5 percent of the population of China. That's like refuting a claim about Americans by calling it "a very non-Pennsylvanian view".
Because China is not the only place where Chinese languages are spoken. There’s more than 10 million ethnic Chinese in Southeast Asia alone. And it’s not only a mainland-centric view: it’s a mainland–Mandarin speaking centric view.
