It needs to be changed. Just because it's always been a certain way doesn't mean it's right. Out of all the major sports, this is the one OT that doesn't make any sense. Imagine if the NBA came down to teams flipping a coin for the first possession and then if the team that gets possession hits a 3, the game is over. All the other sports let you play BOTH offense and defense
If you want it to be like how it is for the regular season and first rounds of the playoffs then fine but the conference championship games and Super Bowl need to be changed. The biggest reason why they wanted it to be as close to sudden death as possible is because playing a full 10+ minute period is too physically demanding. But with the bye week next week (and in the Super Bowl, no game next week), it makes more sense to give both teams a fair chance to play however long possible to determine a winner