You should watch it. Jenny does a great job breaking down what they did right and wrong. And it turns out it was such a monumental project that you need four hours to talk about it fully.
Our attention spans are dropping precipitously, and it worries me.
True, but those are feature films. After an hour or two the audience starts losing the plot, literally. Jenny's video I would describe more as a documentary (I'd categorize most video essays as such), which typically run for much longer without losing too much.