Part of it is cultural.
Every culture is different, and one womans idea of good food is another's idea of inedible.
For instance, the Mormons in Utah eat sugar in absolutely everything- sugary sauces on meat, salads, vegetables, all drinks, and so on.
Personally, I find it horrible, but I have mormon friends (well, Jack mormon friends) who grew up on it, and they wont eat salad without sugary salad dressing.
Some cultures love bitter. Others spicy. Umami was virtually unknown in the West, until japanese chefs introduced us to the concept.
So- its unfair to use your personal version of Italian culture as a yardstick for all other foods.
That said, of course, some of what you are saying is true, for SOME argentines.
But not all.
I have a Porteno friend whose mother is the "Julia Child" of Argentina, who has written and taught argentines to cook better for decades. Her books are bestsellers, her classes always full. If you watch any local tv, there are always cooking shows with real gourmet chefs cooking.
There is a cooking subculture here, that values good food, fresh ingredients, and looks around the world for inspiration.
I have been coming to Argentina since 2007, and I have noticed huge differences in the food available, and the restaurant cooking, since then.
And many of those chefs, like, say, Lele Christobal of Cafe San Juan, have been on TV, spreading the idea that there is more to life than Milanesa.
Most people, in most countries, eat crappy food. Particularly if they dont have a strong homogenous culture. Italy, and Japan, may be exceptions, but certainly street food, and average home food, in England, or the USA, is pretty terrible.
McDonalds is the biggest restaurant chain in the world, and they have em in Italy too.
In the last 20 years or so, Argentina has become much more aware of the outside world. This applies to literature, music, art, and, yes, cuisine.
But most people fix their tastes in all those things by the time they are 20 or so- most US citizens over 35, for example, refuse to even try sushi, while most kids grow up eating it, and think its no big deal.
To change Argentine food culture will take years, as the old grandmothers will not change their tastes- it has to filter down thru the 20 somethings, the ones who are now, for the first time, eating mexican food and sushi and bagels and ramen and so on.