You're raising multiple points, but I'll try to get at a couple of them before my attention span flitters off elsewhere.

* SF was not intended to be a messageboard.  Of course people have a need to converse, but the site wasn't set up to handle that.  It was set up to handle sysadmin Q&A (the way votes rearrange posts nonsequentially is a big tipoff here).  Using a spork as a shovel is *possible* but there will be a lot of complaints about its ability to do the job effectively.

* What is SU FOR if not questions pertaining to individual systems?  By the definition you've given, everything computer-related *could* apply to sysadmin, and therefore SU has no reason to exist.  There's got to be a line somewhere.  **Migrating questions to SU isn't some kind of punishment** - it's about sending the question to the place where it should get the best answers.

* As to the glib & rude responses - DOWNVOTE!!  When I get a downvote to an answer, I think long and hard about whether I'm speaking from experience or wild conjecture - about whether I've phrased my response professionally or obnoxiously, etc.  At the very least, maybe you can help downvote the snarky comments right out of existence.