I’m not so sure this method is very effective for languages whose pronunciations require more effort, have less vowels in accordance with consonants or are more guttural. How about tonal languages like Chinese dialects and other Asian languages? Some people simply learn better by being able to associate an image with the sound, like how the spelling in Pinyin and the accents on letters help to better reinforce tone usage and pronunciation. I myself am a Mandarin student and I found learning the language to be more difficult will the less Pinyin I used because of the language’s many homophones. There needs to be a little bit of written instruction for listening and speaking to actually be effective.