[amanbolat]

As I know there are more people in the south part of China Mainland, who speak and write Cantonese and they have always been using pinyin or keyboard. So if you already can use one type of input why bother and create one more for a smaller group? Nobody in government cares about what type of keyboard you use...

In addition, most of native Russian speakers do use English/American keyboard to write Russian because it is much easier rather than finding one with Cyrillic symbols.