The NOVA classifications are difficult to work with, and I think the trend of certain nutrition scientists (and the media that reports on those scientists' work) have completely over-weighted the value of the "ultra processed" category.
The typical whole grain, multigrain bread sold at the store qualifies as ultra-processed, in large part because whole grain flour is harder to shape into loaves than white flour, and manufacturers add things like gluten to the dough. Gluten, of course, already "naturally" exists in any wheat bread, so it's not exactly a harmful ingredient. But that additive tips the loaf of bread into ultra processed (or UPF or NOVA category 4), same as Doritos.
But whole grain bread isn't as bad for you as Doritos or Coca Cola. So why do these studies treat them as the same? And whole grain factory bread is almost certainly better for you than the local bakery's white bread (merely processed food or NOVA category 3), made from industrially produced white flour, with the germ and bran removed during milling. Or industrially produced potato chips, which are usually considered simply processed foods in category 3 when not flavored with anything other than salt, which certainly aren't more nutritious or healthier than that whole wheat bread or pasta.
If specific ingredients are a problem, we should study those ingredients. If specific combinations or characteristics are a problem, we should study those combinations. Don't throw out the baby (healthy ultra processed foods) with the bathwater (unhealthy ultra processed foods).
And I'm not even going to get into how the system is fundamentally unsuited for evaluating fermented, aged, or pickled foods, especially dairy.
So why not focus on the foods containing that stuff, rather than the superficial resemblance of all foods that kinda look like the foods that contain that stuff?
Let's say you have a problem with potassium bromate, a dough additive linked to cancer that remains legal in U.S. bread but is banned in places like Canada, the UK, the EU.
So let's have that conversation about bromate! Let's not lump all industrially produced breads into that category, even in countries where bromate has been banned.