MPS II has been roundly criticized for being difficult to learn, and by 1986 mainland China's Hanyu Pinyin had already caught on throughout most of the international community. MPS II never really took root in Taiwan, and it had virtually no chance of being accepted abroad.
再加上注音符號第二式屢被批評複雜難學，而國際間則普遍使用大陸的漢語拼音，因此不但國內使用率不高，海外推行也不甚順利。