You are right...ACCURATE daily news case reports would be very useful IF testing rates remained constant, reporting was consistent, and the definition of a "case" was consistent. None of those things are true. Not just the US. A "case" in Sweden is different than a "case" in Egypt, etc.
I think the US also has the unique issue of there being "too many cooks in the kitchen". We have county government, city government, state government, private hospitals, health organizations, and federal government all using different metrics, different definitions, different timelines, different resources, and different agendas in their management. Leads to a Charlie Foxtrot in data interpretation for decision-making purposes.