Are brakes and reversers also meant to provide redundancy for each other?
Is it not also a good idea procedurally in case one is um, "forgotten?"
I was on a flight once that had quite a bounce after touchdown, I'd guess 10 feet, after which we rolled on the runway for a good 5-10 seconds before the reversers kicked in. I mention this because if something distracting like that happens, isn't it best if some automatic system (brakes/spoilers) takes effect?