While some readers here are very familiar with the terminology of the field and would easily understand standard abbreviations, I am guessing that many readers coming here might benefit from inclusion of the expanded form.
The example that brought me to this question was the use of ISP in this answer. (Undo asked what ISP meant in a comment, so I would presumably not be the only one in the dark.)
Being a technical field with long terms, abbreviations are natural, and the goal of being friendly to professionals would tend to encourage their use.
Using the technical familiarity of the asker (estimated by the wording of the question itself) might be a useful guideline. If a question is very technical, those who can understand the question or its answers are more likely to be familiar with more field-specific terminology. If a question is relatively non-technical, the asker and many of those interested are less likely to be familiar with such.
The desired length and directness of posts does encourage a more compact (in reading length not necessarily character count) presentation and this medium is perhaps not as friendly to a glossary (though having such might be helpful) or depending on previous expansions of an abbreviation (answer order can change).
One possibility that comes to mind is to use "long term (LT)" format for terms that are less likely to be familiar and "LT (long term)" when the term is more likely to be discernible to the readers. The latter format might have most of the reading speed advantages of a bare abbreviation (the parenthetic expansion might be scanned over somewhat quickly) to those familiar with the term. (Very familiar an/or unambiguous abbreviations could stand without even parenthetical expansion.)
(Judging familiarity [or even discoverability] might be difficult, but I think some guidelines would be helpful.)
Note, I am not suggesting expansion of abbreviations that are proper names (whether of organizations or projects).
NASA
, which might have explanation in the selected tags anyway. If a request for clarification is posted in comments, then it's IMO best to edit it in. $\endgroup$