You are suffering from the delusion that WIC is intended to cover all the food a baby needs. WIC is merely to help prevent malnutrition by ensuring that certain nutrients that are commonly missing from young children's diets are included. However because of the heavy lobbying from the infant food industry combined with the need to guarantee prices and availability the foods used to provide these nutrients are suboptimal.
WIC does not, nor has it ever, provided 100% of the formula the average infant needs to survive.WIC provides 26 fl oz per day whereas most infants take 28-32oz per day. And because you should generally keep a baby on the same formula that leaves parents to provide the rest generally by purchasing one of the more expensive brands.
Also all WIC allows to substitute powder for the liquid concentrate or even ready-to-feed with a doctors note. The liquid concentrate is presumably to help prevent fluorodosis. Although even with liquid concentrate you should use distilled or other non-fluoridated water.
The juice is basically provide enough vitamin C to prevent scurvy. Because fruit and vegetables packagers/growers can not guarantee price or availability AND because the entire WIC check must generally be used at one time fresh is not an option. Nor do many have the storage room for frozen. Dried would be far better if you could guarantee sulphite and dye free.
The infant cereal is to prevent anemia, though newer studies show it actually causes it. The same goes for the hot or cold cereal for older kids. The milk is for the vitamin D and calcium, though again their are superior sources.
Tuna is given to breastfeeding women for reasons I can not fathom as it is so high in mercury (even the lower mercury varieties). I've get to divine the reason nursing women get carrots.
Beans and lentils are a cheap and storeable source of protein, iron, and folate. Peanut butter is a poorer option but until they teach people how to cook with beans and lentils its a better option (many people I know on WIC have cupboards full of unused beans).
Eggs are actually probably the only truly good food on the list, though insufficient in quantity. And eggs that contain DHA would be preferable. At least, however, eggs contain choline and other fats needed for brain development, usable zinc and usable vitamin D.
As for being unable to breastfeed because of the narcotics given during delivery that is just silly. You know, and I know, and hopefully everyone on here knows that those narcotics would cease to be in your system at some point and then your milk would be fine -even if the narcotics given were truly incompatible with breastfeeding. Rarely are any of the meds used during pregnancy and delivery incompatible with breastfeeding. I do not minimize the difficulty of getting a baby to breast that hasn't nursed in their first days -I've done it. But it is far from impossible.