>This HN thing of casually using acronyms without defining them is baffling to me

You have a whole internet at your fingertips with which to look up terms you don't understand without diluting the thread, but if you need at all to do that you should consider that you might not have anything relevant to add to the conversation to begin with. Hacker News is supposed to be a forum of educated professionals and domain experts, we shouldn't have to dumb things down here.