As you mentioned, the tag is used for corner cases alone. Similarly to 3D, someone might face a graphic design question when using the software, and that's why the tag is there (although I don't think solidworks is as related to design as 3D is).
That being said, I don't think any of the current questions tagged as solidworks is a good fit, and this is reflected by the very low number of votes and answers they got, but then again, it might be related to the field. Citing Alan Gilbertson:
We -- designers in general and gd.se in particular -- have to be
willing to embrace the technologies that get the job done.
This is the reason why we have this task. All tags that are not used for a certain period of time get deleted, so they are sort of self-cleaning. I think, however, that we might need to discuss if the possible cases are so little that Solidworks should considered off-topic.