Koyaanisqatsi (1982) - made me realize the degree to which society has been mechanized, how our alienation to nature and each other is almost guaranteed if we give ourselves over to technology.
And.. despite eventually discovering what Reggio is about, I have always taken the opposite view of the movie. To me it feels like a neutral view of how systematized our world is, how technology enables such systems, and how such systems are a fundamental and valuable part of moving forwards as a species. Humans = technology = systems.. but positivity for such things is my world view anyway, and Koy is a blank enough canvas to take this on.
The second sequel Naqoyqatsi felt like a more on the nose critique of the ills of technology and modern society to me, made up entirely of stock video set to a fragile but very human soundtrack, in contrast to Koy.
And maybe that was the artist's intent all along. From the title I doubt it but I read that originally the filmmaker wanted it released without any title.
There is a nice segment about industrialization in Planet of the Humans. I wouldn't mind if they made another full length movie out of it.