The original discussion of the mechanics tag had many votes against it and no votes for it. Unless there are new arguments to keep it, we should burninate the tag now. We have 161 questions tagged with it at the moment, and none usefully that I can see.
Has anyone double-checked to see if we have any questions with only the mechanics tag?
Is there a trick to learning the Pacesetter/Goblinoid Action Table?
Can I default to Swimming?
When escalating from a change of style in With Great Power, what card has to be played?
What are the differences between Pathfinder's Kingmaker and Birthright?
These were the only ones I've found.