HF probably just decided they didn't want to handle the warranty claims anymore on their discontinued items. IMHO anything they sell that plugs in is below par and won't stand up to the rigors of daily shop use. .............
While true for many of their hand-held electrical items like small angle grinders, 120v pistol drills, it doesn't apply to most, if not all of the larger electrically powered machinery such as pedestal grinders and buffers, lathes, mills, compressors, and even welders and plasma cutters.
Many of those items are the same as those carried by other suppliers but with a different color paint.
Many of them come from exactly the same factories in China, but the HF ones will be less well finished and will require adjusting and cleaning at the very least, and quite likely a little reworking too; and I would think that there would be less returns of those items as most purchasers realize that they're buying a kit of loosely assembled parts at a low price.
Just my opinion though, the logic behind the policies of most large corporations is way beyond me.
M