Also coconut oil can usually serve as a more healthy substitute for butter, except for with baking maybe

I've used coconut oil in place of shortening but have not yet tried replacing butter completely in anything. I expect that due to different melting points coconut oil would not be good for anything where you have to cut butter into dry ingredients (biscuits, streusel, etc.) but it might well do just fine in cases where the butter is intended to be melted or softened only.