I've seen some closings that I consider valid--such as a couple of shopping questions, but I think that the moderators have become a little ambitious towards closing some guitars.SE questions in an attempt to "avoid the problems on guitars.SE" (direct quote). First off, I'm not really sure what that means, so an elaboration on that would be nice--but in particular if we are to enforce the driving logic behind closing questions like the one linked then all questions related to the specifics of some gear (guitar electronics, amp design, effects design, pedalboard design, ad nauseum) should be closed as well. I could argue that circuit design on a Stratocaster is electrical engineering, and consequently belongs on physics.SE, etcetera. The distinction between subject matter inside a broader topic is best handled by tags, not closings. It just so happens that circuit design and a good bit of eMag are very heavily utilized subject matter when designing and describing amplifiers, electric guitars, and guitar effects. It's a cross cutting aspect that in my opinion very much belongs here--every bit as much as questions related to repair, general maintenance, and technique.