Except for legal documents and contracts -
does it really matter as long as the "hearer" gets/understands what the "speaker" meant?
However, I am more comfortable with "conventional/correct/precise" usage of words and "conventional" spellings of those words.
It is also helpful - to me, anyway - to have what an acronym means spelled out - at least the first time it's used.
The same set of letters can mean different things to different people.
Example: In a hospital setting - the diagnosis was Shortness of Breath - but it was not spelled out. As a newbie, I was wondering if this patient had an unpleasant temperament - and thought it was unusual for something like that to be on the Kardex (that's what they used back then) - although if that was so, it was good to be aware of that.