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You could very well be right Morty, but another reason they coat DE blades is to fill in the scratches left by machine honing. It's why they feel so "sharp & smooth", but as soon as the coating...

I think it also depends on how the razor will sit unused. If you use the same blade a few days in a row it will blunt before corrosion gets a chance to set in so leaving the blade in the razor is...