For those who revel in linguistic diversity, this is all good fun. For those who want languages in general to “behave”, and for those in particular who want Arabic to be a single, graspable thing, this is a mess. For the language learner, it’s a daunting task. To be competent in “Arabic” means to learn one language to read and write, and a related but rather different language (like Latin and then Italian) to be able to speak. On top of that, the poor foreigner will be limited to understanding only a fraction of the Arab world. Speaking of the decline of pan-Arabism, it’s likely that the inability of Arabs to move around the region, speak naturally and be easily understood is a big reason they do not always feel themselves to be one
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