"I feel like the people arguing that cooking is a giant obstacle can't be doing it in good faith. "
I am one of those people and I am arguing in good faith. I have seen it with my own eyes.
It is not "just" skills or "just" kitchen or "just" utensils or "just" unfamiliarity with the basics or "just" being tired after getting home late (poor people often work bad schedules). It is a bit of everything, and the resulting complex is hard to disentangle.
On a similar note, have you never seen, e.g., obese people who never exercise? It is again a bit of everything. They are not used to it, they feel bad when starting, they can easily overdo it, they feel ashamed going into a gym etc. All this summed together results in avoidant behavior, even though no single reason dominates it.
Yes, all those obstacles can be overcome, but we shouldn't expect everyone to just simply leap over them. All humans aren't built this way. If they were, humanity as a whole would look a lot different than it does.
My point was that if a person learns to cook early in life, they will consider it more natural and most of those obstacles will be easier to overcome for them. They will have all the circuits wired in, so to say.
I have a similar experience when exercising. I was never obese, but my mother never exercised. Simply never. (Ironically, at 74, she is in perfect health.) And thus, I didn't understand how exercise even makes sense as a kid. I had to learn it for years. It is hard to describe how challenging is it to adjust your mindset and rhythm of life to something that was completely alien to you in your first 20 years of life, especially if that activity is optional and there is no external pressure. You can do it, but various relapses and "falling off the wagon" are way more frequent than if that activity is second nature to you.
If we want to fix things on societal level, we must be realistic. Recipes like "just do X", where X is something nontrivial, feel good and easy (especially to doers of X), but they don't have a good track record in actually achieving society-wide changes. They work for some individuals, but they have a scaling problem.