On Finloq's gun I belong to the "leave it alone and shoot it" side. No one, repeat NO ONE, using only metal removal (grinding/buffing), can "restore" that revolver without seriously weakening it and/or making it look even worse.
Now, if a restorer wants to get into filling the pits with weld and that sort of thing, that would be different but would run the price up to a ridiculous level for what is, after all, a very common gun.
One other approach, fill the pits with plastic and paint the gun, is an option, but for myself I would prefer to do what I said in the first sentence.
Jim