In a few years, not now, we'll be able to look back and say with some confidence which actions saved lives (and didn't have an equivalently large negative effect on the economy). It does seem likely that, in areas with dense populations like cities, rapid early isolation made a significant difference in the overall impact on the care system. It is still entirely unclear what the longer term outcomes will be, since we can't all isolate indefinitely, so presumably, everybody will get infected eventually.