I've been reading the New Yorker for years (though I feel they've become even more politically charged than usual within the past year and have since stopped) a

I've been reading the New Yorker for years (though I feel they've become even more politically charged than usual within the past year and have since stopped) and was always irked by those damn diaereses. It makes "oo" easier to parse as separate syllables, but English has a huge amount of non-phonetic words. Why does this get an exception?