Yes, I know the 1st down rule changed last year. But my points still stands.
The 2 minute warning was added in the NFL to give an advantage to a team trying to score at the end of the game by giving them an extra timeout. In college, the clock stopping on 1st downs gives the team trying to score at the end of the game an advantage by giving them extra mini-timeouts. It seems redundant to me to have both.