I was listening to a discussion on YouTube and one commenter constantly (and irritatingly, to me) would insert in his talk what I would ordinarily consider prose abbreviations. Instead of saying, "For example" he would say "e.g." Similarly, he would utter "i.e." when he meant "that is". But I have always thought these abbreviations were spoken out, just as you don't usually call something an "Ave" for avenue or "St" for street. Am I misinformed or ignorant? Don't answer the last since I am certain I know what most of you will reply.
And that's the point. Is it natural or usual to use abbreviations in normal speech as opposed to writing? Where is the advantage to saying "i.e." instead of "that is" since both require the same number of syllables but the abbreviation may not be comprehensible to some. I have always considered these to be strictly for use in writing since they limit the necessary typing of terms but they seem elitist in ordinary conversation.