There's also the fact that healthy food kinda sucks: It rots fast and is usually not premade. I'm surprised the market for healthy fast food is too small for Nestle/Kraft etc to bother with.
It generally rots quickly (and is thus not premade) specifically because it's healthy. Rotting indicates the presence of thriving yeast/mold/bacteria, which can't live without nutrients to feed on.
There are plenty of decently-nutritious pre-made meals in the freezer section of your grocery store. If "take the wrapping off and put it in the oven for an hour" is too much work, though, there's always Soylent.
We're aiming for a middle ground with MealSquares. Even easier than Soylent (no prep) but also made of whole foods. Caveat: same as OP complaint, they last something like a month compared to 6+ months for most of our competitors.
We ran into the exact problems talked about in the article when trying to bake our prototypes in a home oven. Even heating is next to impossible. Working with a convection oven now is much better.
Part of an unhealthy food culture is some people find it hard to cook, both the difficulty and the time involved.
A well price oven that's easier and quicker might have a lot of run on health benefits.