Split from here. I don't agree that speaking Classical Arabic, or "written Arabic" sounds awkward. The thing that sounds awkward is when someone has not yet mastered a language and try to speak it, but this applies to all languages. Speaking al-Fus7a in a everyday setting, assuming you speak it well, sounds professional and respectable. As al-Fus7a means first studying it since there is no one (or very very few) that actually has it as their native language.