English+ASCII is simple because the rules are simple, not because the US invented the standard first.
Nobody studding sociology has came out and claimed they couldn't do it only because of their language, but nearly nobody questions that the language was an important factor, and they were very diverse groups, with little else in common.
Hangeul has very simple rules, and is generally simple, but if you want Hangul Jamo (i.e., archaic letters that don't compose neatly into "standardized" syllables), you'll be in a similar place as if you want to produce mediaeval ligatures or thorn letters. Þis is hardly ever neſceſʒary in modern text.