Because 'z' is unambiguous. If it sounds like a 'z' it must be a 'z'. Especially from the perspective of a non-native speaker, or someone who needs to learn to

Because 'z' is unambiguous. If it sounds like a 'z' it must be a 'z'. Especially from the perspective of a non-native speaker, or someone who needs to learn to read and write as an adult. As for your other questions? https://en.wikipedia.org/wiki/English-language_spelling_reform https://en.wikipedia.org/wiki/English-language_spelling_refo.... Also feel free to look up specifically Noah Webster.