Another benefit with the brakes behind the forks is that they don't clog as easily when going through mud or snow. Most of the clogging comes from the snow/mud being thrown forwards (from the top of the wheel) and then hitting the fork as the bike moves forwards. Having the brakes behind means that the mud/snow ends up on the fork and doesn't block the brake - which can be an issue when comuting in snowy weather as it tends to freeze solid before you go home Having the brake behind the fork means that you still have a working front brake.
/Andy
I had the opposite problem last summer on a rainy day on a gravel road with my Nomad Mk II, my rear V brake got so much mud all over that when I applied the brake the springs were not strong enough to release it. I had to stop, get off the bike, pull the brake pads off of the rim manually. Then get back on the bike and start riding again. Thus, I effectively had only one brake plus an emergency brake. Part of the problem was that I did not use fenders (mudguards) on that trip, it is an S&S coupled bike and I left the fenders at home due to the complications that fenders would have added for shipping and assembly/disassembly.
I normally use cantilever brakes, have them on my Sherpa and two other bikes. If I had cantilevers on the Nomad, it would not have been a problem. I initially tried to set up cantilevers on the rear of that bike but without a frame mounted brake hanger, I had some difficulties and eventually went with the V brakes that caused my problem.
This topic reminded me that I was a spectator at a cyclocross race a few years ago. And I brought some of my good camera gear for that event. I looked back at my photos and there were a few racers that used V brakes but the vast majority of racers used cantilevers. This was before any races allowed disc brakes, so no photos of discs. First photo you can see some mud buildup on the V brake areas of the bike that is closest to the camera, the second and third photos show cantilevers. Overall the cantilevers appeared to accumulate less mud than the V brakes.