The reason that restoration on coins and cards is frowned upon is that the value of each is very much dependent on its grade. Compare a vintage baseball card in Good to Very Good condition to the same one in NR MT to MT condition. The difference might be a hundred fold. As such, collectors demand that whatever grade a coin or card receives is the real thing.
That wouldn't apply to a painting. If a restorer touched up a Picasso, I doubt it would affect the price very much. If major work was done, then it probably would have more of an effect. But baseball cards and coins are very condition sensitive.
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