There are a few hundred thousand words in English. No adult knows them all. What does an adult do when he or she encounters a word they don't know? I bet they look at the letters and syllables, left to right. Then make a stab at the pronunciation, and look for any familiar root words that are part of the new word, etc., and then use a dictionary.
It would seem that everyone would be better off learning to look at the letters and syllables that make up a word, and learning to pronounce and discern the meaning of most new words to some extent, and then use a dictionary.
You'll notice that to keep up with this vast flow Bill Gates actually implemented an overt program of substituting Hieroglyphics where practical!