How Black Friday works:
Companies release products 6-12 months in advance. On the day of their release they are at their most valuable. Every day that goes by they slowly lose a little bit of desirability. For practicality, and human marketing reasons, companies do not adjust their prices every day to reflect the reduction in demand. Instead they gather all the erosion into one big clump and release it in a frenzy on Black Friday.
So are there "deals" on Black Friday? Not really, in the sense that you are buying a product that is of truly lower value. At the same time, many people don't care about the newness of various products, so are happy to trade that time for money in their pocket. In short, Black Friday is about segmentation than it is "deals". It's a way to charge the most eager top dollar at the beginning of the curve, while also cashing in later with the rest at the end of the product lifecycle.
Thank you.