I noticed this gradient and knew it didn't used to be there. I thought for a long time there was something wrong with my TV. I would walk around the room looking at the TV from different angles and would move the progress bar to different points in the video. I was looking at the color settings and other known-color images. Ultimately I'm glad I saw this article and I can stop thinking I've gone crazy out that my tv is broken!
I like the new colors tbh, but it's a very very very minor update and can't avoid speculating how much that thing cost Google, 5 x 300k/year salaries x ... 2 years maybe? Lol.