The designed scope of ham.stackexchange.com (ham.SE) and a few other other Stack Exchange sites overlap somewhat in what are often called "gray areas". (Or "grey areas", if you prefer.) One such gray area exists between ham.SE and electronics.SE. ham.SE questions should be about Amateur radio specifically, or the technology of radio (or Morse code) [source]. Questions in electronics.SE should be about electrical and electronics engineering topics primarily [source]. So if someone wanted to ask a question about radio design, e.g. "What are the advantages of the phasing method of generating SSB?", such a question would land squarely in the gray area, potentially equally at home in either site, because the question is about both radio and electronics design. Another such gray area exists between ham.SE and dsp.SE, where questions are about signal, image, and video processing. Other gray areas exist also.
Some "gray area" questions could be considered closer to one group than the other (or others). The arguments seem to get louder when the question being discussed is primarily about theory, rather than practice. For instance, questions about the best way to hoist a large antenna up a tower rarely attract arguments about scope in ham.SE, but questions about the nature of the electric and magnetic field components of a radio wave sometimes do, because such questions are answered by referring to Maxwell's equations, which many people would argue are a better subject for physics.SE than ham.SE.
Should gray-area questions that are primarily theoretical be allowed here?