Analytics are great for games like baseball, where you can keep track of in-depth stats like how a particular batter does against left-handed pitchers or a certain type of pitch.
So much of football isn't quantifiable. There are no stats as to whether a receiver ran the correct route on a play or whether a DB blew a coverage or was supposed to get safety help, for example. Others are misleading, such as interceptions or quarterback ratings (interceptions may or may not be the QBs fault, and ratings are only useful to generate a general estimate of efficiency over a long period of time.)