Perhaps we need to look up the definitions of arguing.

1: give reasons or cite evidence in support of an idea, action, or theory, typically with the aim of persuading others to share one's view
"defense attorneys argue that the police lacked “probable cause” to arrest the driver"
2: exchange or express diverging or opposite views, typically in a heated or angry way.
"dont argue with me!"

When Paj says "I don't understand your argument", I think she's using the first definition which is used to describe a kind of debate, rather than the second which is used to describe a verbal "fight", so to say.

Me reading technical talk:

I personally think that there's no better diet than a diet similar to what the bird may eat in the wild.

What parrots eat in the wild is only partly relevant. Your bird's natural habits should certainly be taken into consideration when planning the diet. But the energy needs and general lifestyle of pet birds is very different from that of wild birds, so their nutritional needs will be different. According to Koutsos et al,

"The diets consumed by free-living birds can rarely be duplicated in captivity because the vast range of seeds and other food items are not usually available in sufficient quantities. Even if these food items, or very similar ones, could be obtained, they may still not be nutritionally adequate. This is because birds usually eat a quantity of food necessary to satisfy their energy needs, and free-living birds have to expend considerable energy to support thermoregulation, extensive foraging, defenses, etc... Thus, the amount of food consumed by a free-living bird is much greater than the amount of the same foods consumed by that bird in captivity. However, the daily need for amino acids, minerals, and vitamins is relatively constant regardless of energy expenditure. Therefore, birds in captivity must acquire the same daily quantity of essential nutrients as free-living birds but with much less food consumed. Consequently, the concentrations (g/kg) of amino acids, vitamins, and minerals must be higher in captive diets than wild diets, and food items that might be sufficient for a wild bird can be inadequate for the same bird in captivity. Additionally, birds in the wild do not always have the nutritional wisdom to select adequate diets. Many animals are able to balance energy, amino acid, and calcium levels in their diets by selecting among dietary items, but there is little evidence that animals can select for adequate levels of many other nutrients."

In other words, captive birds need food that has lower calorie density and higher density of other nutrients than the food they'd eat in the wild. But the paper goes on to say that domestic plants have it the other way around.

"The nutritional characteristics of food items from domestic plants are often very different from those from native plants. In general, seeds from domestic plants are more concentrated in energy and lower in protein and many other essential nutrients than seeds available in the wild. Likewise, domestic fruits and vegetables are higher in energy and water but lower in other essential nutrients compared with relatives in the wild."

It's likely that many if not most wild birds have nutritional deficiencies, so the wild diet is not necessarily a good example of what the optimal diet would be. Voren says, "There are populations of birds and animals in habitats all over the world that survive and reproduce on grossly deficient diets. All a pair of living things has to do in order to maintain a population is survive long enough to produce two offspring that, in turn, survive long enough to reproduce. Living a long, healthy life has nothing to do with this." Koutsos et al and Klasing comment on the ability of birds to select adequate levels of some nutrients (including protein, calcium and salt) but their inability to select for other nutrients. The wild diet is obviously good enough to keep the species going but it's not likely to be a "perfect" diet that maximizes their life expectancy. The food supply is too variable and unreliable for that. Wild birds have a much shorter life expectancy than pets, largely because so many of them get picked off by predators. But predators prey on the weak, and how many of their victims are weak because of diet deficiencies or diet-related disease? There's no way for us to know.