^^^ +1
That's what I was saying. Two brakes are NOT redundant. Each have different purposes and I use them both. I run an interrupter cross lever for the front brake to relax on the tops.

Tandems often have a drum brake at the rear on top of two regular brakes. And that's not even redundant because it has a specific use on descents.

Hehe you could set up a bike with 4 brakes: 2 rims brakes and 2 disc or drum brakes. Like in here