Interesting thread, and interesting viewpoints...however, the Original Poster has made a valid point that has somehow been lost in the ensuing melee. Abbreviations, in my experience, are commonly used amongst professionals, or at least experts in a certain area of study as a matter of course; e.g., EPA in environmentalist terms is Environmental Protection Agency; PSD is Prevention of Significant Deterioration; BACT = Best Available Control Technology. I can use these terms with impunity among those in the profession, but probably most on this forum wouldn't get much past EPA.
It seems to me that the OP (Original Poster) should keep in mind his audience; if the post is likely to be read by the Newby, and you wish the inexperienced to glean any information from the post, perhaps you should spell it out for their benefit. The suggestion that there should be a list of definitions and acronyms is a very good one; and I would hope the moderators would take this and run with it. It would be very useful tool for all of us. I have been around tractors some, and I know what PTO means, but most of the other acronyms are unknown to me. Granted I don't get involved in the technical discussions much, but a readily available appendix would be a big help, at least to those of us who rarely use a SH or a LO.