This thread is discussing acronyms on GN.
Problems with grammar and syntax in a more general way are something entirely different.
The range of acronyms used on GN is in a list clearly indicated at the beginning and end of every thread. 31 in all, several of which are rarely if ever used, and many are so similar that their meaning is self-evident.
The world is full of acronyms. After writing this post I may well watch a DVD or listen to a CD
As for When at University/training it was always drummed into us that you do not use acronyms (or at the very least you must in the first instance write the full text with the acronym in brackets after) - permissible then to use the acronym in the same body of text.
Yes, I am doing this in a piece of course work at the moment, but the conventions governing an academic document are not those governing ondinary every day communication and are needed to meet the very specific needs of an academic environment.
In academic documents, every bit of information must be followed by a reference to the source of the information and while, yes, we do sometimes post links to help someone or prove something, our posts if we had to meet academic referencing expectations would be burdensome in the extreme and would effectively kill GN.
As they say, horses for courses.