Youtube learned the wrong lesson and started to optimize the algorithm for retention and length. It is annoying to click for a review of some product that looks like a lengthy one with probably tests and what not only to see painfully slow unboxing and a wikipedia read of the history of the product and company and then sponsor read and then they turn on the device for a minute and give arbitrary score.
Exact same info could have been communicated in 30seconds, but then they wouldn’t get sponsor money and mid video ad roll