I think it also revealed just how quickly a bunch of otherwise very hard problems can be to solve with global collective action. The fuckin Ganga was running clear water for the only time in my lifetime because for 2 weeks nobody threw garbage in it. The canals in Venice had fish.
Covid lockdowns demonstrated, in a deeply imperfect way, the possibility of large-scale social solidarity for a higher cause. That is a prime reason why so many powerful people want us to run screaming away from them into the comforting arms of selfish individualist competition.