Not really a U-turn; the situation has radically changed from march, but some countries haven't caught up
There is a big difference between using lockdown as an emergency measure to gain time when a "novel" and dnagerous virus first becomes pandemic
and continuing to use it as a blunt instrument because a government has wasted the time due to incompetence and cronyism
Lockdown should be reserved as an emergency measure only.
Everyday use means compliance will be seriously reduced if there actually is an emergency situation sometime this winter
However, it should really be avoidable, because the 2nd wave still looks more manageable than the first, also with far better knowledge tools to handle it
There is also a big difference in which countries should even consider lockdown:
Lockdowns are probably only suitable for developed economies, with large elderly populations at higher risk, and which can financially support workers laid off and support businesses to continue
A developing country with a much younger population and with many other causes of high deaths probably can't afford to lockdown or have the same need.
They would suffer far worse consequences of lockdown than Western countries:
with starvation, malnutrition, millions of mid-teen girls never returning to school ...