they are just lazy or too old, actually typing simplified Chinese it's faster than English, amount of characters you have to type/swipe to deliver same content it's much lower than with latin languages due to length of words and primitive grammar (even more primitive than English and that's already something compared to European languages with tons of grammatical cases and forms for each word and multiple plurals and genders, heck Chinese doesn't even have singular, if they would switch to pinyin they could conquer the world)