This is a straw man.
The new guidelines prioritize meat and dairy above all else, which comes with well known health issues, especially at the rate Americans consume them.
There's already plenty of evidence (victory lap press releases from the respective industries) that indicate that this was accomplished due to lobbying... so we haven't moved at all: the old recommendations were imperfect and fueled by specific industry preference, and the new ones do the same.
> we can't improve health drastically and more effectively by making simple and clear recommendations to move away form processed food.
pretty much every nutritionist has been urging a reduction in processed foods for years now, the solution isn't to replace processed foods with meat and dairy... that's just a different problem
What are the "well known health issues"? I have seen some low-quality observational studies (junk science) which show some weak correlation between consumption of animal products and negative health outcomes but so far nothing conclusive one way or the other.
https://peterattiamd.com/high-protein-diets-and-cancer-risk/