The work toward this kind of 'ready to eat' food has already started, with companies selling things like https://mealsquares.com/ or https://jimmyjoy.com/.

The zeitgeist seems to be about going back to more natural food though, at least in my circles.

The underlying fear is that what is sold as 'nutritionally complete' food is actually incomplete, but that we don't know enough about nutrition yet to notice it : so the best strategy is to keep a tried and true diet, like a Mediterranean diet.