This may seem like a silly question but there is some merit to it. From what I have seen, most of the questions with the electric-circuits tag get voted off or get multiple comments that it should be in the Electrical Engineering SE. Even though engineering (especially electrical) has large overlapping areas with physics, I can understand most physics members not wanting to answer EE questions because it feels like you're outside of your zone. So my question is, with this current state, why not just get rid of the tag to discourage hardware questions on our feed?
The reason we have the tag is that basic circuits are a part of any standard introductory electromagnetism class. It's a matter of some opinion where you draw the line for "basic", but it's usually taken to include batteries, switches, resistors (including light bulbs and wires), capacitors, inductors, various kinds of (idealized) meters, and maybe diodes. Simple circuits are a very effective way of introducing some core physics concepts that get used all the way up through quantum field theory etc., so if you wanted to argue that even these simple circuits should not be within our scope, I suspect you'd have a tough time of it.
Any more complicated circuits are generally taken to be beyond the scope of physics. I don't think we get many of those questions, though.