No idea about the Taiwan joints.
The inner joint is adjustable with shims, so it isn't "bad" until the ball is so oblong that you can't get free motion throughout the range without the clearance being too large at the usual position. My book doesn't give a limit for this, but I'd say that .005" is too much. Generally (tho not always) the other components are reusable.
The "ideal" clearance is only .002", which is just barely perceptible ... if you can see any play in the joint, it's probably best to adjust it sooner rather than later. If you do, chances are good that all the components can be reused except the tab washers. Tabs & shims are available from the usual suspects, only a buck or two each.
The important part when removing them is to support the shaft from turning, rather than letting it try to turn against the pinion. The ones on the Stag were tight, but not overly so. You will need some big wrenches, that fit correctly, though. I don't recall the sizes offhand (and a 4A would likely be different anyway), but I do remember they were unusual enough to not be found in my toolbox.