There are some places that have proper test and trace in place, but the reality of the situation in the country as a whole is twofold. We don't have enough testing medium and there are not enough public health epis employed to do it at a wide scale. Federal, state, county, and cities gov'ts would have to at least double their staffing to do it at a wide scale (many areas would have to go much further)... and there are not enough qualified people nor are their budgets to support that. It is a good goal and a great one to state, but the reality just isn't there for the staff to track that many cases. On the testing, if you lower the accuracy, you can greatly increase how many tests can be given... but you're going to get a lot more false positives. It becomes a quality vs quantity compromise.
Not all places have seen an uptick in cases when re-opening. Some have, some haven't. But odds are there will be an overall uptick if the virus isn't curbed by temperature (still signs are there that it is). The spread will increase as people get back into groups inside together. The initial point of the 'flatten the curve' was to keep hospitals from being overrun... overall (NYC metro being the large exception) that has held true in the US. Many hospitals are under capacity and could handle an uptick to a certain degree. NYC won't be able to for a while. Each area is going to be different and needs to have some leeway on handling it and regions should be working together on a strategy.
I'd argue the US hasn't had a well thought out plan through this whole situation. Everything has been reactionary. The closures were sped up to quell pressure and attempt to reign in numbers without even a thought to how to re-open. It was a quick drastic measure. We've heard plenty of arguments for a while that we shouldn't even think about re-opening until x, y, and z happen. Which isn't a realistic with people or the situation. The second areas closed, plans and benchmarks should have been established to figure out how and when to re-open. Because that hasn't been happening 5-6-7 weeks into this, and there are vast economic and personal ramifications, people are getting testy and demanding to open. Which is causing this reactionary opening we are seeing. I understand why things can be reactionary and at first, sometimes that is the best that can be done... this far into it, there should be solid plans of how to move forward.
Some places have done it. Polis has outlined it well for Colorado... not only publicly, but inside the state's public health handling of it.