> The frequent rain and mud makes it to the rim brake shoes and diminish braking power

I'll never forget when I was a kid (13 or so) going for a ride in the city during a downpour, slamming on the brakes because a pedestrian stepped out in front of me (mixed pedestrian/bike zone, no cars, we both assumed no-one else was dumb enough to be out), and ... nothing happened. Damn near shat my pants. Luckily the pedestrian saw me and jumped out of the way.

In retrospect that was too much downpour. Could literally see water spraying out my brakes. The hot cocoa after was fantastic tho