You might need that extra couple of hundred feet of rollout on a slippery runway that was supposedly "braking action reported as fair/medium".
Especially in the non-normal landing direction, on a rainy day, with all the rubber at the stopping end.
I used to adjust flaps & thrust for takeoff in a similar situation; in case of an RTO to gain a few more meters. It caused various interesting reactions from the other seat when we 'didn't just use the numbers'. But that's another topic and I do to wish to 'creep the thread'.