But and comma (u and a) have completely different sounds in English. And boot and book (oo) have the same sound in the north of England, albeit they do sounds

But and comma (u and a) have completely different sounds in English. And boot and book (oo) have the same sound in the north of England, albeit they do sounds differently in the south. I don’t really see how this writing system will work when it’s “alphabet” is already different depending on your accent.