100 lbs is ALOT of water! It takes some pretty special conditions to get that kind of snow build up. That test was definitely biased as it was two of the professional riders for Cat that made it.
That said, snow does build up on raw aluminum and that's why I've gotten rid of most of mine by wrapping/painting/powdercoating every bit of it that I can. Between the Lines Designs sells a product that they bill as something that snow won't stick to. What the heck do they call that? Ice-free tunnel coating something or other. Anyway, I did the inside of my tunnel, my rear suspension brackets, and my running boards with it last year. It wasn't ice free but it was certainly better than raw aluminum.
So for a couple hundred bucks you can dress up your sled AND keep the weight down. Think of how much the Cat guys spend to cut weight on their sleds! I don't know a single one that doesn't dump hundreds of dollars into his ride the moment he gets it to try to cut weight and improve performance.
Not needed with a Pro! Just start and go! And then do what you want as an option not because you have to!