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Well, that SA sear is definitely not good, though it might not be noticed in functioning, and the trigger was probably replaced for that reason. The hand might have been replaced to time the gun better and ensure proper lockup. (The new parts are not MIM.)
It is hard to determine the reason without seeing the gun and the parts; no reflection on your excellent photography, but it can't match "hands-on" for determining something like that.
What they seem to have done was to rebuild your revolver and bring it up to factory specs, free. The "problem" in such cases is that the customer (you) had an old, smooth gun, and liked it that way. Something about pleasing all the folks sometimes or some folks all the time or something like that.
Jim
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