Having spent some time in Sweden, I can speculate about another major difference between Sweden and the United States that might be very significant in thinking about approaches.
The Swedish people in general seem more likely to trust their political leaders and public health authorities. In the United States, we see people in huge numbers intentionally disregarding social distancing and masking measures.
The Swedish people seem to have taken those measures much more seriously.
It’s probably unwise to compare the US approach and the Swedish approach without taking this into consideration. Looking at voluntary compliance levels would seem really important.
Have the Swedes begun to experience compliance fatigue? Will an upsurge in cases motivate them to be more careful? Are masks and social distancing more important than lockdowns? Lots of questions here needing good data.