Good point. If you've never done one, the most common issue in a high angle situation, is, anchoring, taking yourself off belay, and, having the carabiners used for the brake go plummetting down into where-ever's-ville. Hard to remember to attach them or keep hold of them. If you pull the rope through...they're gone! You can do a carabiner brake with a single locker (as the first biner on your harness) then two sets of two from there on out. I've done with one, two or three carabiners as the brake. Class C? Only for the last rappel...and expect to lose your biners! Especially if the rope length is set to the pool drop. Not that complex. Its a locker, two biners opposite and opposed, bite of rope up through those two biners, then, clip a set of biners across the two biners and under the bite. Once you do it a few times, the concept is easy. Back in the day, folks carried 6 ovals for this purpose. Now, you're cobbling together whatever biners you have. Different sizes and wire gates make it harder to do. That adds to the complexity. But...I'd do a biner brake WAAAAY before I'd do a long rappel on a munter hitch. A biner brake is smooth and doesn't twist the rope. I usually carry at least a couple of "alpine quickdraws" in canyons. And, at least two of those biners are bigger. Automatically have the hardware for a biner block (given I have a locking carabiner too).