How far would one go, and how useful would it be? Especially given the variation in raw ingredients even before we start tweaking the recipe.
Just a simple tabulation, carbohydrate, fat, protein, total calories would be subject to a lot of inaccuracy - even assuming correctly calculated in the first place. How many of us would refer to that?
Suppose the recipe requires 1kg of beef brisket. Different butchers in different locations will trim the meat to varying extents, then if you buy meat from grass fed shorthorn cattle, and I buy grain fed Scotch Aberdeen Angus beef, the fat % will vary enormously, so the fat and protein tabulated will be wrong for at least one of us, probably both as average or even historic values will have been used.
It would be a huge overhead for the editorial team to do the calculations and insert them in the layout, and if they have the time and brainpower to spare, to be honest I’d rather they spent it getting the indexing right.