Here's industry reports
https://www.nationalbeefwire.com/doctors-group-applauds-comm...
https://www.wattagnet.com/business-markets/policy-legislatio...
And straight up lobbying groups
https://www.nationalchickencouncil.org/new-dietary-guideline...
https://www.meatinstitute.org/press/recommend-prioritizing-p...
Lobbying groups, putting out press releases, claiming victory...
Here's some things you won't find in any of the documents, including the PDFs at the bottom: community gardens, local food, farmers markets, grass fed, free range... Because agribusiness doesn't make money with those.
Just because you might like the results doesn't mean they aren't corrupt as hell
It's still decent a guidance, but the previous one was as well.
Some protein is obviously desirable, but the ratios, like anything else in chemistry/biology, are paramount.
I don't think the USA has a problem with under consumption of meat and dairy. If anything, it has a long standing overconsumption problem.
You're right that ratios matter enormously, but optimal ratios vary significantly by individual - genetics, activity level, metabolic health, and existing conditions all play roles. The overconsumption concern is valid for processed meats and in the context of sedentary lifestyles with excess calories, but the picture is less clear for whole-food animal proteins in balanced diets.
The real issue might be less about meat/dairy per se and more about displacement of other beneficial foods (fiber, polyphenols, etc) and overall dietary patterns. Many Americans do overconsume calories generally, but some subpopulations (elderly, athletes, those on restricted diets) may actually benefit from more protein.