This is perhaps true for English, isolating language with clear word boundaries. Making spellchecker for Russian (inflecting language), Japanese (I think they

This is perhaps true for English, isolating language with clear word boundaries. Making spellchecker for Russian (inflecting language), Japanese (I think they don't always put spaces between words, Koreans less so) or Finnish (agglutinating language) still takes good part of a decade, more or less.