If you think about it most aspects are the same: layout, controls, artwork, etc. The only real difference across platforms are the emulator.cfg files. This is due to the naming conventions but it should still be the same in Linux, Raspbian, OSX, etc. and really only Windows is pretty different in this area.
If you isolate the Pi questions then users of other OSs might not see solutions to their problems when they don't relate to the emulators.cfg. When people post a question or problem they need to list the OS they are using otherwise they can't expect to get a good answer.
For what it's worth, people that build their Pi themselves understand how things work, at least to some extent. When people use 3rd party images, they have no clue. I'm not adverse to helping them but they should really ask the creator of their image for help. A prime example would be the Floob images that are on this site. They show a few bugs but certainly not all of them. The bugs have never been updated and they cause 90% of the questions.
At the end of the day, people need to update their OS and AM before asking questions. That's IT 101.