Regular seasonTies are still possible
Regular-season overtime has a fixed extra period. If the score remains tied after that period, the game ends as a tie. That is why end-of-overtime clock management can matter almost as much as field position.
Common argument"The first touchdown always wins"
That used to be an easier shortcut, but it is no longer reliable. The current overtime structure is built around possession opportunity first, then sudden death once both teams have had their chance or an exception ends it.