https://www.urbandictionary.com/define.php?term=Hindsight+is+2020&defid=15107140

Refers to a realization and clarity on how we humans live on our planet that occurred internationally during the covid-19 pandemic

A play on or modification of the previous phrase 'hindsight is 20/20,' referring to clear vision.

Guy in 2030: It's crazy how once we used to sit in traffic, burning fossil fuels for hours per day.. and how when you'd buy something, it would be wrapped in layers and layers of plastic.
Girl in 2030: Well things all changed during the global covid-19 pandemic. People re-assessed how our whole world was operating. They say hindsight is 2020.