I have to say, I don't know if it's from the translator or the original, but one of those people clearly doesn't bake.
Like, shortening is the fancy thing for baking, you only use butter as a substitute when you're missing shortening. Shortening has a higher fat content so when your baking it adds more richness and tenderness to whatever you made. Butter is partially water and as such makes the recipe less rich and tender.