I agree about butter, ariadne. Love the stuff. I have it in the house all the time and use it all the time, so I differ from you in that respect
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I never avoid using butter, except when I think another fat would work even better, such as in a frying pan, when I'm more likely to use goose fat or lard or beef fat. Why? Quite simply for taste and food value. See Jennifer McLagan's book Fat: an appreciation of a misunderstood ingredient with recipes. The book backs up what I've always thought.
On the fly leaf: "For all of history, minus the last thirty years, fat has been at the center of human diets and cultures..... according to Jennifer McLagan, not only is our fat phobia overwrought, it also hasn't benefited us in any way. Instead it has driven us into the arms of trans fats and refined carbohydrates."
It has struck me on this thread just how many of the comfort foods people go for are high in fat. There's a good reason for that. Fat is good food.