Not necessarilly a reply to you Woodbeef, just thought I'd tag my thoughts in here.
As far as inferior metal goes, why is that necessarily so bad. The claim is that the metal is poor quality, so they must use more of it to get the proper amount of strength for the tractor to function. How is this bad? One of the most common discussions on this board is about people having to fill tires, add front weights, add rear weights, 3 pt weights, etc. to get enough weight for their tractor to reach optimum performance. So if a manufacturer chooses to use lighter, stronger, more costly metal that causes the end user to have to install 1000 pounds of weight on a tractor that cost more up front, what has that end user really gained because of this superior metal. Meanwhile, the tractor with the inferior metal is already heavy and already cheaper - how is that so bad. I would bet that the older Fords, JDs, IHs, Cases, etc. were made with "inferior metal" one of the reasons that they were so heavy and also so durable, so maybe it isn't so bad after all.
As a former owner of one of the tractors that used inferior metal (my Belarus 420 AN had 57 hp and tipped the scales at about 7,000 pounds), I do agree there are large castings and pieces of plate on the tractor, but nothing ever broke or leaked through a casting (the hydraulic system leaked at practically every coupling and tube, though - but the engine never leaked or burned one drop of oil in the years that I owned the tractor which was pretty good for any engine, I thought - my nissan, isuzu, ford, international and 1st suzuki can't claim that - my 2nd suzuki can, but anyway).
Again, can't see the harm in this allegedly cheaper metal unless tractors are falling apart because of it. It does seem that there is the conception that just because the second tier of tractors (Mahindras, Kiotis, Century/Branson, TYM) are cheaper, they are somehow an inferior product, and I can't agree with that. They may have lower resale, and their dealers have not been around as long, of that there is no doubt - but the tractors themselves are solid performers.