They just don't have enough people and/or the technology made available to them to see and call everything that goes on during the modern day game.
We don't know if the refs have asked or refuse to use the latest technology or for an additional ref on the field. We also don't know if the NFL wants to keep the traditional aspects of the game like the chain gang. We don't know why the NFL has the money to modernize the game to eliminate many of the issues yet refuses to adapt quickly.
It does look suspicious when millions of dollars are bet on games and the NFL doesn't want to shore up the integrity of the game through technology.
We don't know if the refs have asked or refuse to use the latest technology or for an additional ref on the field. We also don't know if the NFL wants to keep the traditional aspects of the game like the chain gang. We don't know why the NFL has the money to modernize the game to eliminate many of the issues yet refuses to adapt quickly.
It does look suspicious when millions of dollars are bet on games and the NFL doesn't want to shore up the integrity of the game through technology.