That's certainly true, so the best solution, is to get high quality waterproof overmitts, and wear them over your normal gloves.
The best quality ones ive seen, are made by the Motorcycle equipment firm, Dianese, a motorcycling friend has a pair, and he is very impressed with their performance.
I recon most people would not mind wearing motorcycling overmitts, especially when their performance in poor weather, is magnificent.