Ignoring the fact that Koreans still have to use Chinese characters in technical snd academic contexts and the fact that the unstoppable change of language means that certain spellings are already becoming non-phonetic, from a technical point of view it's the same issue. If you look at Unicode Korean still has to use thousands of characters for precomposed Hangul blocks. Koreans also have to use input methods to convert from keystrokes representing individual Hangul letters to one of the thousands of precomposed Hangul codepoints. In fact the fact that Korean input methods like to change the precomposed characters in the text field as you type makes it more likely to break than Chinese and Japanese input methods.