I wonder if having a tag of type gis-principle around is necessary. The excerpt and wiki say:
Use for questions which involve a GIS principle or theory and are software agnostic
A large proportion of questions asked at GIS SE come out of someone's use of GIS software.
However, there are some where the question is more theoretical than applied, and in those case, using the gis-principle tag acts to alert potential answers that the asker is not interested in being provided with the steps to use in a particular software.
It does not help sorting questions by their specific GIS subject. I believe it is already pretty easy to infer if a question is theoretical, applied or both, by just reading what is written in the title and body.
Moreover, I see this tag carrying an implied message that usually questions in GIS SE should be software related (for example: we don't have a counter tag for 'gis-principle' as 'gis-application').
Currently, the tag is used only on 77 posts and it would be easy to eliminate it.
Should we treat theoretical GIS questions different from applied ones, when comes to tagging?