What would be the point of the time limit in the playoffs? Somebody still needs to win. I agree the rules could be different for the playoffs and that the regular season rules can stay as they are.
I'm looking at shortened OT quarters as well here.
Thought I had in mind is that team A has a 6:30 drive for a TD. Team B then has 2:30 to tie. Givens everyone a possession, but shortens the OT period. Could lead to more ties though as well, and that's not ideal.