and if you're stuck the teacher will tell you to sound it out.
And if you've never been exposed to phonics how are you going to know how to sound words out? I learned to read back in the '50s, when teaching phonics was at its peak, and it's served me well ever since. Being Jewish, I went to Hebrew School and learned to read Hebrew but not, alas, to speak it. Up through my 20s and into my 30s I could sight read it during religious services, but gradually stopped going and lost the ability. Now, I can still read Hebrew out loud, but slowly, sounding it out one word at a time except for the occasional word that I recognize. I very seriously doubt that I could do that if I only knew whole word reading because once you've forgotten what a word looks like, it's gone for good. My older sister can also read Hebrew the same way: she knows the letters and grew up with phonics just like I did. How many people do you think that can learn to read out loud in a strange language and a different alphabet by using whole word reading? Doing it with phonics takes time and practice, but once you know that alphabet, it's just a matter of practice.