Covered this too and was critical of Cuomo/Murphy for delaying the formal shutdown, but the shutdown was largely in effect on 3/16, when NY/NJ/NY shut down schools, bars, restaurants and entertainment venues, so the difference between them and SF was minor. By far, the biggest factor in shutdowns being weeks later than they could have been was the lack of testing, as you know.
Hard to argue for shutdowns with no data, as no tests were run before 3/3 (and 1 death in the 2 states) and <1000 tests per day until mid-March, when we needed to be running at least 20-30K tests per day - we probably had 50-100K positive cases by mid-March and had no clue, because the Administration failed miserably to do what most of the successful countries did - test early and aggressively (and trac/isolate and wear masks) - if we had known the extent of the outbreak by early March and shut down then (or even just had universal masking), we'd have saved 75-90% of the lives lost in the NE US, as per several studies.
And since I'm sure you'll fall back on your useless go-to argument of size, the DC to Boston megalopolis has 52MM people in 56,200 sq mi for a density of 931/sq mi. South Korea is very similar with 51MM people in 38,700 sq mi for a density of 1317/sq mi. The megalopolis has roughly 18K cases and 1300 deaths per 1MM people, while South Korea has 267 cases and 8 deaths per 1MM, i.e., the megalopolis has 67X the cases and 162X the number of deaths as SK (the US numbers are 11.6K cases and 428 deaths per 1MM for ratios of 43X the cases and 54X the deaths as SK). Are you telling me we couldn't have done for the NE US what SK did for themselves?
South Korea managed to keep an area almost as large and a bit more densely populated than the NE megalopolis largely free from the virus without ever enforcing rigid lockdowns and the US, with more rigid lockdowns has come nowhere close to SK. I'm not going to retype everything SK did vs. the US, but if you want to read it, it's in an earlier post.
https://rutgers.forums.rivals.com/t...entions-and-more.191275/page-141#post-4587498