I think I heard that OSU was a 2.5 to 3.0 point favorite against ND. So kicking the extra point did matter to bettors, at least.
I was also under the impression that the extra second mattered more with the kickoff than the extra point. That the team still has to try the PAT even if the TD put them ahead. Of course if there is no time left, the team can still take a knee if they want.
But if the team that scored the TD, with no time left, is behind or tied, then they definitely get to try the PAT with no time on the clock. That we can all agree on.